What is a dermatologist really, and when should you see one?

The skin is an organ

We tend to think of the skin as a simple covering.

But it is our most extensive organ.

It acts as a barrier against the environment. It participates in temperature regulation. It protects us from external agents. It is involved in sensory perception.

And sometimes it can show signs of diseases that did not originate in the skin itself.

The AAD reminds us precisely that certain skin manifestations can be clues to internal diseases, and that the dermatologist studies that relationship between the skin and the rest of the body.

What diseases does a dermatologist treat?

Thousands of different conditions. But we can group them into broad families.

Acne

Acne is much more than 'having pimples'.

It can produce: inflammation, nodules, cysts, residual marks, and permanent scars.

A dermatologist does not only treat the lesion we see today. They also work to prevent scarring and to manage the disease over the long term.

Rosacea

Persistent redness. Visible vessels. Inflammatory flare-ups. A burning sensation.

Rosacea can be confused with acne or with simply having 'sensitive skin'. But the treatment is different.

Dermatitis and eczema

Itching. Dryness. Inflammation. Scaling.

Dermatitis can have very different causes: atopic, seborrheic, irritant, allergic contact, among others.

Two rashes that look similar may require different treatments.

Psoriasis

Psoriasis is an immune-mediated inflammatory disease.

It can affect: the skin, scalp, nails and, in certain patients, the joints.

That is why it is not simply a disease of 'dry, scaly skin'.

Infections

Dermatology also covers infections: bacterial, viral, fungal and parasitic.

From impetigo to certain mycoses, viral warts or scalp infections.

Spots and pigmentation disorders

Melasma. Vitiligo. Solar lentigines. Post-inflammatory hyperpigmentation. White patches on the skin.

Each one has different mechanisms and treatments.

That is why one of the dermatologist's roles is to decide first: what type of spot we are looking at.

Moles and skin cancer

Probably one of the most important fields in Dermatology is the prevention and early diagnosis of skin cancer.

Melanoma. Basal cell carcinoma. Squamous cell carcinoma.

A new, different, or changing lesion that bleeds or does not heal may need a dermatological evaluation.

And when we examine pigmented lesions, dermatoscopy allows us to observe structures that we cannot properly see with the naked eye.

When should you show a mole to a dermatologist?

Especially when it: changes, grows, displays several colors, becomes asymmetrical, has irregular borders, bleeds, itches persistently, or simply looks different from the others.

But it is not necessary to wait until a mole 'looks terrible'. In skin cancer prevention, detecting changes early is precisely the goal.

Hair also belongs to Dermatology

Yes. Hair loss is a dermatological concern.

Androgenetic alopecia. Alopecia areata. Telogen effluvium. Scarring alopecias. All of them are part of Dermatology.

When a dermatologist dedicates a specific part of their practice to the study of hair, we generally speak of trichology, and they may be described as a trichologist or as a dermatologist with a specific focus on hair and scalp conditions.

That is why hair loss should not automatically be reduced to: 'Take some vitamins'. We must first determine what type of alopecia is present.

And what about nails?

Those too.

Changes in nail color, shape, thickness, fragility, detachment, or pigmentation can be caused by a variety of conditions.

Fungal infections are only one of the possibilities.

A pigmented line on a nail, for example, may be completely benign, but certain characteristics require a specific evaluation.

When should we make an appointment with a dermatologist?

There are many situations. But some are especially common.

A new lesion that is changing

Especially if: it grows, changes color, bleeds, or does not heal.

A rash that persists

A dermatitis that does not improve or keeps coming back deserves a proper diagnosis.

Persistent itching

Itching without a clear explanation may also require a dermatological evaluation.

Inflammatory acne or acne with scarring

The sooner we bring certain types of acne under control, the better our chances of reducing the development of scars.

Hair loss

Especially when: it is intense, it persists, it progressively reduces density, or areas of complete hair loss appear.

Changes in the nails

Above all if they are new, progressive, or affect a single nail in a striking way.

Do you need to have a disease in order to see a dermatologist?

Not necessarily. Dermatology also focuses on prevention.

A person with many moles, a personal history of skin cancer, intense sun exposure, or certain risk characteristics may need periodic check-ups.

The frequency should be individualized. There is no universal schedule that applies identically to the entire population.

What happens during a dermatological consultation?

First, we talk. When did the problem appear? How has it evolved? Does it itch? Does it hurt? What treatments have been used? Are there any relevant medical conditions or medications?

Then we examine the skin.

Depending on the problem, we may use additional tools. For example: dermatoscopy for pigmented lesions, trichoscopy for hair and scalp, cultures or scrapings in certain infections, patch testing when we suspect contact allergy, or a skin biopsy when we need to analyze tissue under the microscope.

What is a skin biopsy?

It consists of obtaining a small sample from a lesion to analyze it histologically.

It does not automatically mean that we are thinking about cancer.

A biopsy can be used to diagnose numerous inflammatory, autoimmune, and tumor-related conditions.

When a lesion requires microscopic confirmation, pathological anatomy can provide the definitive diagnosis.

Private dermatologist or public health system?

The term private dermatologist appears frequently in patient searches.

The choice depends on access, availability, healthcare coverage, and individual needs.

From a medical standpoint, what matters is that the patient receives an adequate evaluation and that certain situations requiring rapid diagnosis are not unnecessarily delayed.

And "dermatologist near me"?

It is another very common search. It makes sense.

When a worrying lesion appears, many people simply search for 'dermatologist near me'.

In these cases, beyond proximity, it is worth considering which area we need: general dermatology, oncological dermatology, trichology, pediatric dermatology, dermatological surgery, or aesthetic medicine.

What is a laser dermatologist?

The term laser dermatologist also appears in searches.

Dermatological lasers can be used for very different problems: certain pigmented lesions, vessels, scars, photoaging, resurfacing, tattoos, and other indications.

But a laser is not a diagnosis.

Before choosing a wavelength or a device, we need to know: what lesion we are treating.

This is especially important with pigmented lesions. A suspicious lesion should not simply be removed with a laser before its nature is known.

What about aesthetic medicine?

It can also form part of dermatological practice.

Wrinkles. Skin quality. Photoaging. Acne scars. Pigmentation.

Treatments with botulinum toxin, fillers, peels, and certain lasers can be used within a dermatological approach.

The advantage of a medical evaluation is that we can first determine whether something that appears purely aesthetic truly is.

The AAD specifically highlights that a lesion that looks like an 'age spot' can sometimes require diagnosis before being treated cosmetically.

When should we not wait?

There are some situations where it is advisable to seek medical evaluation more promptly: a rapidly changing lesion, a wound that will not heal, repeated spontaneous bleeding, an extensive rash accompanied by fever or general malaise, extensive blistering, significant pain, rapidly progressing signs of infection, or certain skin reactions after starting a medication.

The skin can be the first clue to a problem that requires medical evaluation.

Do all dermatological consultations require treatment?

No.

Sometimes the outcome of a good consultation is simply: 'This is benign and requires no treatment.' And that, too, is medicine.

We do not have to remove everything we see on the skin. Sometimes we must observe. Sometimes treat. Sometimes biopsy. And sometimes simply reassure.

What I want you to remember

A dermatologist is not simply 'the doctor for spots and moles.'

They are the doctor who studies diseases of the skin, hair, and nails.

From a common dermatitis to alopecia. From acne to melanoma. From a cosmetic blemish to a lesion that requires a biopsy.

That is why you do not have to wait for a lesion to become painful or very obvious before seeking a consultation.

If something appears, persists, changes, itches, bleeds, will not heal, or you simply do not know what it is, a dermatological evaluation can help you put a name to it.

And, as we have said many times on Le Docteur vous explique: first we diagnose. Then we decide whether we need to observe, treat, or prevent.