In short. How a dermatology consultation works: the history, the whole-skin examination, dermoscopy, and the tests that turn a visible pattern into a diagnosis.
Key points
- A diagnosis in plain language, an explanation of what is known and what is uncertain, a treatment plan with realistic timescales, and a clear answer to the question of what happens if it does not work.
Dermatology is the specialty of the skin, hair, nails, and mucous membranes. It is also, more than most specialties, a discipline of looking: many dermatologic diagnoses are made from the history and the appearance of the skin, and the rest of the work is confirming, excluding, or monitoring what the eye suggests. Here is how that process runs.
The consultation begins with the history
Before the skin is examined, the story matters. When did it start? Is it itchy, painful, or asymptomatic? Is it constant or intermittent? What has already been tried, and did it help? What else is going on — other medical conditions, regular medicines, family history, occupation, sun exposure, pets, travel? A rash that comes and goes within hours is a different problem from one that has been fixed in place for a year, and no photograph on a screen replaces that account.
Examination and dermoscopy
The examination is systematic rather than a glance at the reported spot: the whole skin surface where relevant, including the scalp, nails, palms, soles, and mucosae, because a second site often changes the diagnosis. Dermoscopy — examination with a magnifying instrument and polarised light — adds a view of structures below the surface: pigment networks, vessels, and the patterns that distinguish harmless lesions from those that need a biopsy. It sharpens clinical judgement; it does not replace it.
Reaching a diagnosis
Some diagnoses are made at the bedside, by pattern recognition built over years. Others need evidence: a skin scraping examined for fungus, a swab, a patch test for contact allergy, blood tests, or a skin biopsy for histology. When the diagnosis remains uncertain after a fair period of correct treatment, the honest step is usually to get tissue rather than to keep guessing, because guessing has a cost measured in months.
What a good consultation should give you
A diagnosis in plain language, an explanation of what is known and what is uncertain, a treatment plan with realistic timescales, and a clear answer to the question of what happens if it does not work.
What dermatology can and cannot do
Dermatology is good at diagnosing, at controlling, and at monitoring over years. It is less good at erasing: many chronic conditions, once established, are managed rather than cured, and treatment often takes weeks before a difference is visible. Anyone promising a permanent cure for a chronic rash, or instant removal of a mark, is describing something the specialty cannot deliver.
Arrange prompt review if
- A mole or lesion is changing in size, shape, or colour, or bleeding, crusting, or itching without explanation.
- A rash comes with fever, blistering, peeling, or sores in the mouth or eyes — that needs urgent assessment.
- Skin infection spreads quickly, becomes very painful, or is accompanied by fever or feeling unwell.
Frequently asked questions
Why does the history matter as much as looking at the skin?
When a rash started, whether it is itchy, painful or constant, what has already been tried and whether it helped, and what else is going on all narrow the possibilities. A rash that comes and goes within hours is a different problem from one fixed in place for a year.
What does dermoscopy add to an examination?
A view of structures below the surface: pigment networks, vessels and the patterns that help distinguish harmless lesions from those needing a biopsy. It sharpens clinical judgement rather than replacing it, and it is used on anything suspicious rather than on the reported spot alone.
When does an uncertain diagnosis call for a biopsy?
When the picture remains unclear after a fair period of correct treatment, or when the result would change management. A skin scraping, swab, patch test, blood test or biopsy turns a visible pattern into a diagnosis rather than a guess, and guessing costs months.
Risks & Limitations
- Most chronic skin disease is managed rather than cured, and relapse is expected.
- Treatments typically need 8–12 weeks before response can be judged fairly.
- Topical treatment can cause irritation, dryness, peeling and photosensitivity.
- Systemic therapy may require blood monitoring and carries organ, metabolic and pregnancy risks.
- Isotretinoin in particular requires strict monitoring and pregnancy prevention.
- Pigment change is often slow and may be incomplete.
- No treatment works for everyone, and response cannot be predicted with certainty.
When to Seek Care
- A mole or lesion that changes in size, shape or colour, or starts to bleed, itch or crust.
- Fever with a widespread rash, blistering, or rash involving the eyes, mouth or genitals — seek emergency care.
- Rapidly spreading redness, swelling or pain in the skin.
- Facial swelling or difficulty breathing — possible severe reaction; seek emergency care immediately.
- New or worsening symptoms while taking a monitored medication.
References & Further Reading
- American Academy of Dermatology (AAD) — public and clinical guidance
- World Health Organization (WHO) — skin and infectious disease resources
- Chinese Medical Association, Dermatology Branch — clinical guidance
- Cochrane Library — systematic reviews in dermatology
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.