In short. The conditions that make up most dermatology practice: inflammatory disease, infections, pigment disorders, lesions and tumours, and hair and nail problems.
Key points
- An itchy rash may be eczema, a fungal infection, scabies, or a contact allergy, and the treatments are entirely different.
- Treating the wrong one wastes weeks and can make the skin worse, which is why examination and, where needed, testing come before a prescription.
Most of what walks through a dermatology clinic is not rare. It is acne, eczema, fungal infection, psoriasis, warts, hives, pigment change, and the ordinary tumours of sun-exposed skin — conditions that are common, often chronic, and usually controllable rather than curable. Knowing which family a problem belongs to is the first step to treating it sensibly.
Inflammatory conditions
Acne, eczema and dermatitis, psoriasis, rosacea, and lichen planus all share a tendency to flare and settle. Treatment aims at control: reducing inflammation, restoring the skin barrier, and identifying triggers that are genuinely worth avoiding. These conditions are managed over months and years, and the plan is usually adjusted rather than finished.
Infections and infestations
Fungal infections of the skin, hair, and nails; viral conditions such as warts, herpes simplex, and shingles; bacterial infections including impetigo and folliculitis; and infestations such as scabies. Some clear with a single course of treatment; others recur because the source was not eliminated or the condition that predisposed to them was never addressed.
Pigment and vascular problems
Melasma, sun spots, post-inflammatory pigmentation after injury or acne, vitiligo, and the flushing and visible vessels of rosacea. Pigment disorders are slow to respond and quick to recur after sun exposure, so honest expectations matter more here than in almost any other area of dermatology.
Lesions and tumours
Moles, seborrhoeic keratoses, cysts, skin tags, and the skin cancers — basal cell carcinoma, squamous cell carcinoma, and melanoma. Distinguishing the harmless majority from the minority that needs removal is one of the most consequential jobs in the specialty, and dermoscopy plus biopsy is how it is done.
Hair, nails, and sweating
Hair loss of several distinct types, scalp disease, nail dystrophy and infection, and excessive sweating. These are frequently treatable, frequently chronic, and almost always require an accurate diagnosis before treatment, rather than a product chosen from a shelf.
One appearance, several causes
An itchy rash may be eczema, a fungal infection, scabies, or a contact allergy, and the treatments are entirely different. Treating the wrong one wastes weeks and can make the skin worse, which is why examination and, where needed, testing come before a prescription.
Do not wait to be seen if
- A new or changing lesion bleeds, crusts, or refuses to heal over several weeks.
- A rash is accompanied by fever, joint pain, blisters, or sores in the mouth or eyes.
- Infection spreads rapidly, or the skin becomes hot, swollen, and painful.
Frequently asked questions
Why do different skin conditions sometimes look identical?
Because an itchy rash may be eczema, a fungal infection, scabies or a contact allergy, and the treatments are entirely different. Treating the wrong one wastes weeks and can make the skin worse, which is why examination and, where needed, testing come before a prescription.
Which conditions make up most of a dermatology clinic?
Acne, eczema, fungal infection, psoriasis, warts, hives, pigment change and the ordinary tumours of sun-exposed skin. They are common, often chronic and usually controllable rather than curable, and knowing which family a problem belongs to is the first step to treating it sensibly.
Why is separating a harmless lesion from a serious one so consequential?
Because most moles, seborrhoeic keratoses and cysts are harmless while a minority need removal, and the two can look alike on the surface. Dermoscopy plus biopsy is how they are separated, and delay changes the size of the excision and the risk of spread.
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.