Your face is not a testing ground: the dangers of aesthetic injections without medical supervision

Beauty should never put your health at risk

In recent years, injectable aesthetic treatments have experienced extraordinary growth. Hyaluronic acid, botulinum toxin, and other products used in aesthetic medicine are part of procedures that are increasingly well known and in demand.

Social media daily showcases facial transformations, lip augmentations, wrinkle corrections, and apparently straightforward rejuvenation treatments.

However, this normalization has contributed to a mistaken perception: that aesthetic injections are superficial procedures, practically harmless, and that they can be performed after receiving a short technical training course.

Nothing could be further from the truth.

An aesthetic injection is an invasive procedure that crosses the skin barrier and introduces a substance into living tissue. Depending on the product, the anatomical region, and the technique used, it can affect vascular, nervous, and muscular structures.

Although the vast majority of correctly performed treatments proceed without serious complications, there are risks that must not be minimized.

An arterial occlusion, skin necrosis, a deep infection, or an irreversible loss of vision are not simply unsatisfactory aesthetic outcomes.

They are medical complications that can constitute genuine emergencies.

That is why, before asking how much an injection costs, we should consider something far more important:

Who is performing the procedure, what medical knowledge do they possess, and what capacity do they have to respond if a complication arises?

1. Facial anatomy: what really lies beneath the skin

When we look at a face, we identify its external features: lips, cheeks, nose, forehead, chin, and jawline.

But beneath that surface lies an extraordinarily complex anatomical organization.

The face is made up of different tissue layers, including:

• Epidermis and dermis.

• Subcutaneous cellular tissue and fat compartments.

• Superficial musculoaponeurotic system (SMAS).

• Muscles of facial expression.

• Retaining ligaments.

• Blood vessels and nerve structures.

• Periosteum and deep bony structures.

These structures are not distributed identically in every person.

Age, individual anatomical variations, prior surgical procedures, trauma, and previous aesthetic treatments can modify tissue planes and the relationships between vessels and tissues.

For this reason, knowing facial anatomy does not simply mean memorizing muscle names.

It means understanding their three-dimensional organization, their vascular and nerve relationships, their anatomical variants, and the clinical consequences of an injury.

Facial muscles: much more than expressions

Among the main muscles involved in facial expression we find:

• Frontalis: participates in eyebrow elevation and in the formation of horizontal forehead lines.

• Corrugator supercilii: contributes to vertical lines between the eyebrows.

• Procerus: participates in the transverse lines of the glabellar region.

• Orbicularis oculi: involved in eyelid closure and periocular lines.

• Orbicularis oris: involved in the movements of the lips.

• Zygomaticus major and minor: involved in smiling and the elevation of facial structures.

• Masseter: a fundamental muscle of mastication.

• Platysma: involved in certain movements of the neck and lower face.

Knowledge of these muscles is particularly important for understanding the effects of botulinum toxin treatments.

Incorrect application can cause asymmetries, functional alterations, drooping of the eyebrow or eyelid, difficulties with certain facial movements, and other complications.

But muscles represent only one part of the problem.

The potentially most serious risk of facial fillers lies in the arterial circulation.

2. The facial arteries: a vascular network that leaves no room for improvisation

The face has an abundant vascular supply, with multiple connections between branches arising mainly from the external and internal carotid arteries.

These connections help maintain blood supply to numerous tissues, but they also explain why certain intravascular injections can have serious consequences.

Facial artery

The facial artery, typically originating from the external carotid, courses along the mandibular region and ascends across the face via a variable path.

It contributes to the blood supply of regions such as the lips, the cheek, and certain nasal structures.

Among its branches are the superior and inferior labial arteries.

Its anatomy shows significant variation between individuals.

Angular artery

The angular artery is usually a terminal branch of the facial artery, although anatomical variations exist.

It is located in the region close to the nasolabial fold and the medial canthus of the eye.

Its connections with branches of the ophthalmic system are especially relevant from the standpoint of injection safety.

Supratrochlear and supraorbital arteries

These arteries, related to the ophthalmic artery system, are involved in the blood supply to the forehead and glabellar region.

Their proximity to structures linked to ocular circulation accounts for part of the risk of visual complications associated with certain injections.

Dorsal nasal artery

The dorsal nasal artery is another branch related to the ophthalmic circulation and may establish connections with vessels in the nasal region.

These communications become particularly important in the study of vascular complications of facial fillers.

Superficial temporal artery

It is a terminal branch of the external carotid artery and is involved in the vascularization of the temporal region and the scalp.

Its branches and anatomical relationships must be taken into account during certain facial procedures.

Why is it so important to know these arteries?

Because blood vessels do not always follow the course depicted in anatomical illustrations.

Variations exist in depth, caliber, distribution, and vascular connections.

Furthermore, no region of the face should be considered completely free of risk.

A cannula does not eliminate the possibility of vascular injury either.

There is no injection technique that guarantees an absolutely zero vascular risk.

3. Vascular occlusion: when an injection interrupts blood circulation

One of the most feared complications of facial fillers is vascular occlusion.

It can occur when a filler material accidentally penetrates a blood vessel and obstructs its lumen.

Perfusion alterations may also occur due to external vascular compression.

When the supply of oxygenated blood decreases significantly, the affected tissues may suffer ischemia.

If circulation is not restored, irreversible injury may develop.

What happens during ischemia?

Cells require a continuous supply of oxygen and nutrients to maintain their metabolism.

When blood perfusion is interrupted, oxygen availability decreases, cellular energy production is disrupted, and mechanisms of tissue damage may be triggered.

Severity depends on the location, the extent of the obstruction, collateral circulation, and the time elapsed.

Warning signs

Among the signs that may suggest a vascular complication are:

• Intense or disproportionate pain.

• Sudden pallor of the skin.

• Color changes toward purplish, grayish, or bluish tones.

• Appearance of a reticular or livedo-like skin pattern.

• Alterations in skin temperature and perfusion.

• Subsequent appearance of blisters, ulcerations, or necrotic lesions.

Not all of these signs appear simultaneously, and some occlusions may initially present with subtle or scarcely evident symptoms.

Intense pain, abnormal color changes, or any visual disturbance during or after an injection require urgent medical evaluation.

4. Skin necrosis: when tissues begin to die

Skin necrosis is a potential consequence of prolonged interruption of blood supply.

It can affect the skin and, depending on the extent and depth of the injury, other tissues as well.

Its progression may include ulcerations, tissue loss, permanent scarring, deformities, and the need for reconstructive procedures.

In some situations, the damage may continue to progress during the hours following the injection.

For this reason, automatically attributing intense pain or abnormal discoloration to a simple bruise can delay a necessary intervention.

Early detection and appropriate treatment are essential in order to try to limit the consequences.

Not all complications are fully reversible, even when managed correctly.

5. Blindness from hyaluronic acid: a rare but devastating complication

One of the most serious risks described in the scientific literature is vision loss associated with the accidental intravascular injection of filler materials.

Although this is a rare complication, its consequences can be permanent.

How can a facial injection affect the eye?

Certain facial arteries communicate with branches of the ophthalmic artery, which originates from the internal carotid circulation.

Under specific circumstances, a filler material accidentally injected into an artery can travel in a retrograde direction under pressure and subsequently advance toward vessels supplying ocular structures.

If an obstruction of the retinal circulation occurs, sudden vision loss may develop.

The retina is a neurosensory tissue that is particularly vulnerable to interruption of its blood supply.

What symptoms may appear?

The person may experience:

• Sudden partial or complete vision loss.

• Sudden blurred vision.

• Visual field disturbances.

• Ocular or periocular pain, although it is not always present.

• Ptosis or disturbances in eye movements.

• Other associated neurological symptoms.

Vision loss may occur during the procedure or immediately afterward.

A sudden visual disturbance following an aesthetic injection constitutes a medical emergency and requires immediate ophthalmological attention.

One should not wait to see whether the symptoms resolve spontaneously.

Nor does any treatment exist that can guarantee the recovery of vision once retinal embolization by filler material has occurred.

This fact explains why prevention and the ability to recognize the complication are so important.

6. Can an aesthetic injection cause a stroke?

Yes. Although it is extraordinarily rare, serious neurological complications have been reported, including strokes, related to the embolization of filler materials.

The facial circulation has anatomical connections that, under certain circumstances, can allow filler material to migrate toward intracranial vascular territories.

Warning symptoms include sudden weakness of a limb, deviation of the corner of the mouth, difficulty speaking, visual disturbances, or sudden neurological changes.

In the presence of any of these manifestations, emergency medical assistance must be activated immediately.

This is not about claiming that these complications are common.

It is about recognizing that they are possible and that their severity demands medical expertise, preventive measures, and the capacity to respond.

7. The facial nerves: another essential component of safety

In addition to the arteries, the face contains a complex nerve network.

The facial nerve, the seventh cranial nerve, provides the primary motor innervation of the muscles of facial expression.

Its temporal, zygomatic, buccal, marginal mandibular, and cervical branches have an anatomical distribution of great importance.

The trigeminal nerve, the fifth cranial nerve, is involved primarily in facial sensation through its ophthalmic, maxillary, and mandibular divisions.

During invasive procedures, direct injuries, compression, sensory disturbances, or damage related to inflammation and other mechanisms may occur.

Although serious nerve injuries are less common than transient local discomfort, understanding nerve anatomy is essential for clinical evaluation and the prevention of complications.

8. Why does a course of injections not equate to medical training?

On social media, it is common to come across professionals advertising courses in facial anatomy, needle and cannula techniques, lip treatments, or complication management.

Continuing education is positive and necessary within the competencies of each profession.

However, there is a fundamental difference between learning a technique and having the training required to perform a medical act.

A medical professional receives training in anatomy, physiology, pharmacology, pathology, clinical semiology, diagnosis, therapeutics, and emergency medicine, among other disciplines.

This foundation makes it possible to interpret symptoms and clinical findings within a medical context.

For example, before performing an infiltration it may be necessary to identify a history of autoimmune diseases, active infections, anticoagulant treatments, prior reactions, anatomical variations, or specific contraindications.

It is also important to distinguish a typical inflammatory reaction from an infection, a hypersensitivity reaction, or a vascular complication.

Learning where to insert a needle does not mean knowing how to diagnose or treat all the consequences of an injection.

Aesthetic medicine requires far more than manual dexterity.

It requires clinical judgment, diagnostic ability, pharmacological knowledge, and professional responsibility.

The false sense of security

A certificate of attendance, a masterclass, or a private certification does not automatically replace a healthcare qualification or confer medical competencies.

The length or name of a course does not in itself guarantee the ability to perform invasive procedures.

The question a patient should ask is not how many certificates appear on a wall.

It is whether the professional holds the appropriate qualifications, licensing, experience, and clinical resources to carry out the procedure in accordance with applicable regulations.

9. Who should perform aesthetic injections in Spain?

In Spain, aesthetic medicine is part of regulated healthcare activity.

Royal Decree 1277/2003 contemplates care unit U.48 of Aesthetic Medicine as one in which a physician is responsible for carrying out non-surgical treatments aimed at aesthetic improvement of the body or face.

Injections with filler products, such as hyaluronic acid, should not be confused with superficial cosmetic services.

Performing them requires compliance with professional competencies, the conditions of use of medical devices, and the authorisation requirements of the facility.

The Spanish Society of Aesthetic Medicine has stressed the medical nature of hyaluronic acid injections and the importance of preventing professional intrusion.

It is important to distinguish between non-invasive aesthetic treatments that beauty professionals may perform within their area of competence and invasive medical-aesthetic procedures.

Both activities can be complementary, but they are not equivalent.

Aesthetic training does not replace the medical qualification required to practise aesthetic medicine.

Patient safety must take precedence over any commercial consideration.

10. Botulinum toxin is not simply a cosmetic treatment either

Botulinum toxin is a medication that acts on neuromuscular transmission.

Its use requires assessment of the indications, doses, muscular anatomy, contraindications, and possible interactions.

Inappropriate application can cause eyelid ptosis, facial asymmetries, alterations of the smile, and other functional complications.

In rare circumstances, more extensive effects related to toxin diffusion may occur.

It is important not to confuse its risks with those of facial fillers.

The blindness caused by vascular embolization described in this article is primarily associated with filler materials and does not represent the usual mechanism of complication of botulinum toxin.

Each product has its own pharmacology, its own indications, and its own safety profile.

For this reason, there is no single technique that is valid for all patients, nor should all aesthetic treatments be considered equivalent.

11. What happens if a complication arises during an injection procedure?

This is one of the most important aspects of aesthetic medicine.

The procedure does not end when the needle is withdrawn.

The practitioner must be familiar with the warning signs, have appropriate protocols in place, and know how to respond to a potential complication.

In the case of suspected vascular occlusion caused by hyaluronic acid, immediate interruption of the procedure and urgent medical assessment are essential.

When indicated, treatment may include hyaluronidase, an enzyme capable of breaking down hyaluronic acid.

However, its use requires clinical judgment, knowledge of its indications, and appropriate follow-up.

Hyaluronidase is not a universal solution for all complications and does not reverse all types of filler materials.

In the event of vision loss, emergency ophthalmological care must be arranged without delay.

The management of these complications may require collaboration between different medical specialties and hospital services.

Knowing how to perform an injection is important. Knowing how to recognize a complication and act correctly when one arises is indispensable.

12. Does being a doctor completely eliminate the risks?

No.

Being a doctor does not turn an invasive procedure into a complication-free intervention.

Even experienced professionals can face serious adverse events.

Individual anatomy presents variations, and not all risks can be anticipated or eliminated.

However, adequate medical training, specific experience, proper patient selection, anatomical knowledge, and emergency protocols allow the procedure to be approached with greater clinical guarantees.

The goal of responsible practice is not to promise that a complication will never occur.

It is to reduce avoidable risks, inform the patient, and have the knowledge and resources needed to respond.

Safety begins long before the injection.

13. How to choose a professional before undergoing an aesthetic treatment

Before having a facial injection, it is worth checking several key aspects.

1. Identity and credentials of the professional. Verify who will perform the procedure and whether they hold the necessary qualifications and authorisation.

2. Sanitary authorisation of the centre. Confirm that the activity is carried out in a centre authorised for the procedures it offers.

3. Prior medical assessment. A responsible treatment requires reviewing medical history, medication, contraindications, expectations, and anatomical characteristics.

4. Information about the product. You should know which substance will be used and have access to information about its origin and traceability.

5. Informed consent. The professional must explain to you the expected benefits, the alternatives, the limitations, and the possible complications.

6. Emergency protocols. It is reasonable to ask what measures are in place to recognise and manage an adverse reaction or a vascular complication.

7. Follow-up care. You should receive clear instructions about warning signs and how to seek medical attention if a problem arises.

Be wary of treatments offered without a prior assessment, of products of unknown origin, and of promises of guaranteed results with no risk.

A reduced price should never justify giving up your health and safety guarantees.

14. Frequently asked questions about the risks of aesthetic injections

Is it dangerous to have hyaluronic acid injected into the lips?

Lip injections can cause bruising, swelling, asymmetries, infections and, in infrequent cases, serious vascular complications. The risk depends on multiple factors, including anatomy, the product used and the technique. They must be performed under appropriate medical and healthcare conditions.

Can a hyaluronic acid injection cause blindness?

Yes. Cases of vision loss have been documented following the accidental injection of filler materials into blood vessels connected to the ophthalmic circulation. It is a rare complication, but one that is potentially irreversible.

Which areas of the face carry the greatest vascular concern?

The nasal, glabellar, frontal and periocular regions deserve particular attention due to their connections with the ophthalmic circulation. That said, other facial regions also carry risks, and no area should be considered entirely safe.

Are cannulas safer than needles?

Cannulas can reduce certain risks in specific circumstances, but they do not eliminate the possibility of vascular penetration, tissue injury or other complications. The choice of instrument requires an individualised assessment.

Can a person without medical qualifications perform aesthetic injections in Spain?

Medical-aesthetic injections must comply with professional competencies and Spanish healthcare regulations. Private training in aesthetic techniques does not, in itself, confer the right to perform medical acts. Before undergoing a procedure, patients must verify the qualifications and authorisation of the professional.

What should I do if I experience severe pain after an injection?

Intense or disproportionate pain, especially if accompanied by skin color changes, requires urgent medical assessment. If vision loss, neurological symptoms, or signs of a severe allergic reaction occur, emergency services must be called immediately — dial 112 in Spain.

Can hyaluronidase resolve any complication?

No. Hyaluronidase may be used for certain complications related to hyaluronic acid fillers, but it is not effective for all materials and does not guarantee reversing an already established injury. Its use must be guided by a medical assessment.

How can I tell whether an aesthetic medicine clinic is safe?

Check its health authorization, the identity and qualifications of its practitioners, product traceability, the existence of a medical record, informed consent, and the availability of protocols for managing complications.

15. Responsible aesthetic medicine begins with knowing when not to treat

There is a question that rarely appears in advertising campaigns for aesthetic treatments.

Not every patient needs an injection.

Not every wrinkle requires botulinum toxin.

Not every volume loss needs to be corrected with hyaluronic acid.

And not every aesthetic request represents an appropriate medical indication.

Sometimes, the best decision is to recommend a different treatment, postpone a procedure, or explain to the patient that the requested treatment is not advisable.

Aesthetic medicine must be grounded in individualized assessment, proportionality of treatment, and respect for anatomy and physiology.

The goal should not be to transform a face at any cost.

It should be to preserve its harmony, its functionality, and above all, its health.

Conclusion: your face deserves more than a well-learned technique

The growing popularity of aesthetic treatments must not make us forget that the face is a complex anatomical structure.

Behind a wrinkle, there are muscles.

Behind a facial groove, arteries may run.

Behind a small infiltration, there may be vascular, neurological, and infectious risks that require medical knowledge for their prevention, identification, and treatment.

Serious complications are infrequent, but their existence is sufficiently documented to demand caution.

Ongoing training is necessary, but no private course can by itself replace medical education or the professional competencies required by law.

Choosing a properly qualified professional and an authorised medical centre does not guarantee a perfect result or eliminate all risks, but it constitutes a fundamental protective measure.

Aesthetic medicine does not begin with a needle. It begins with a diagnosis, a thorough knowledge of anatomy, and the medical responsibility to protect the patient's health.

Because your face is not a testing ground.

And your health should never depend on improvisation.

This article is intended for informational and educational purposes only. It does not replace an individualised medical assessment. If you notice signs of vascular, visual, or neurological complications following an aesthetic treatment, seek urgent medical attention.