A dermatologist is a medical doctor who specializes in the skin, hair, and nails — the body’s largest organ and one of the most visible. Their work spans everyday complaints like acne and rashes, serious concerns like skin cancer, and elective cosmetic care. This guide explains the main areas a dermatologist covers, the training behind the title, and how to tell when your concern belongs with a specialist rather than a general clinician.
The short version
Dermatologists are physicians who diagnose and treat conditions of the skin, hair, and nails.
Their work falls into three broad areas: medical, surgical, and cosmetic dermatology.
Common reasons to visit include acne, eczema, psoriasis, suspicious moles, hair loss, and persistent rashes.
They handle skin cancer screening and treatment, which is one of the most important parts of the field.
Only a licensed dermatologist can evaluate your specific skin — this guide is educational, not a diagnosis.
The three sides of dermatology
Most of what a dermatologist does fits into one of three categories. A single practice often covers all three, though some doctors lean heavily toward one area.
Medical dermatology
This is the diagnosis and management of skin, hair, and nail diseases. It covers common conditions such as acne, eczema, psoriasis, rosacea, warts, fungal infections, and hives, along with rarer autoimmune and inflammatory disorders. Treatment might mean topical creams, oral medication, light-based therapy, or ongoing monitoring of a chronic condition. Much of medical dermatology is about getting an accurate diagnosis first, because many skin problems look alike to an untrained eye.
Surgical dermatology
Dermatologists perform a range of in-office procedures. That includes biopsies to sample suspicious tissue, removal of skin cancers, cyst and mole removals, and specialized techniques such as Mohs surgery for certain skin cancers. These procedures are typically done with local anesthesia in the office rather than in a hospital operating room, though complex cases can be referred onward.
Cosmetic dermatology
This is elective care aimed at appearance rather than disease — treatments for wrinkles, sun damage, uneven tone, scarring, and unwanted hair. It can involve chemical peels, laser treatments, and injectables. Because these services are elective, they are usually paid out of pocket rather than billed to insurance.
Common reasons people book a visit
You do not need a dramatic problem to see a dermatologist. People come in for concerns large and small, including:
Acne that over-the-counter products have not resolved.
A new, changing, or unusual mole or spot.
Persistent rashes, itching, or dryness that does not settle.
Hair thinning or unusual shedding.
Nail changes, discoloration, or recurring infections.
A yearly skin check, especially for people with risk factors for skin cancer.
Area
Examples
Usually billed as
Medical
Acne, eczema, psoriasis, infections, rashes
Health care (often insurance-eligible)
Surgical
Biopsies, mole and cyst removal, skin cancer treatment
Health care (often insurance-eligible)
Cosmetic
Peels, laser, injectables, elective corrections
Out of pocket
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The training behind the title
Becoming a dermatologist takes many years. In the United States, the typical path is an undergraduate degree, four years of medical school, a year of internship, and then a multi-year dermatology residency, followed by board certification. That long training is why a board-certified dermatologist can recognize hundreds of skin conditions and distinguish harmless changes from ones that need action. When you are choosing a provider, board certification is a meaningful signal of that background.
Pro tip — write down the timeline of your concern
Before your appointment, note when a spot, rash, or symptom started, whether it has changed, and what makes it better or worse. That short history often helps a dermatologist far more than trying to describe everything from memory in a busy visit.
What a dermatologist is not
A dermatologist is not an esthetician or a general skincare salesperson, though the roles sometimes overlap in cosmetic settings. They also cannot diagnose your skin from a photo shared casually or from a description online. Any specific concern — a changing mole, a stubborn rash, hair loss — deserves an in-person or properly conducted telehealth evaluation with a licensed professional.
When to consider seeing one
As a general rule, it is reasonable to book a visit when a skin, hair, or nail problem is persistent, changing, painful, spreading, or simply worrying you. Anything that looks like it could be skin cancer — a new growth, a sore that will not heal, or a mole that is changing — is worth prompt professional attention rather than waiting to see if it resolves on its own.
Ready to see a dermatologist?
Browse and compare dermatologists near you on Dermatologists At Your Service.
It depends on your health plan. Some plans let you book directly, while others require a referral from a primary care provider before they will cover the visit. Check with your insurer before scheduling so you understand any requirements and out-of-pocket costs.
Is a dermatologist a real medical doctor?
Yes. Dermatologists complete medical school and a dermatology residency, and board-certified dermatologists have passed rigorous exams in the specialty. They can prescribe medication, perform procedures, and diagnose disease.
Can a dermatologist help with cosmetic concerns and medical ones in the same visit?
Sometimes, but cosmetic services are usually elective and paid out of pocket, while medical care may be billed to insurance. If you want both, mention it when booking so the office can plan the visit and explain how each part is billed.
How often should I see a dermatologist?
There is no single answer — it varies with your skin, history, and risk factors. Some people benefit from a yearly skin check, while others go only when a specific concern arises. A dermatologist can recommend a schedule that fits your situation.
General educational information only — NOT medical advice, diagnosis, or treatment. Always consult a licensed dermatologist or physician about your skin and health. Treatments, costs, and insurance coverage vary.
