This page is general education, not medical advice. If you have a new, changing or painful skin concern, contact your GP, a pharmacist or a dermatologist. In an emergency — such as sudden facial swelling or difficulty breathing — call your local emergency number (999 in the UK, 112 in the EU, 911 in the US).
Study room four · skin conditions
When Skin Asks for a Doctor
Skincare can support skin. It cannot diagnose it. These notes help you recognise which is which.
Acne
Acne vulgaris involves excess sebum, clogged follicles, the bacterium Cutibacterium acnes and inflammation. Mild comedonal acne often responds to salicylic acid, benzoyl peroxide or adapalene. Painful cysts, scarring or acne that affects your mood deserve medical treatment early — scarring is far easier to prevent than to correct.
Atopic eczema
Dry, itchy, inflamed patches linked to a weaker barrier and immune factors, often alongside asthma or hay fever. Emollients used generously are the foundation; flares commonly need prescribed treatments. The UK's National Eczema Society publishes practical guidance.
Rosacea
Persistent central facial redness, flushing, visible vessels and sometimes bumps. Triggers include heat, alcohol and spicy food. Prescription options exist.
Psoriasis
Thick, well-defined scaly plaques from accelerated turnover. It is an immune condition; treatment is medical.
Pigmentation & melasma
Dark patches from sun, inflammation or hormones. Daily sunscreen is central; azelaic acid and other agents help, and melasma often benefits from dermatologist input.
Warning signs that need a professional
Some changes should be checked promptly regardless of your routine. Many dermatology organisations teach the ABCDE guide for moles:
- Asymmetry — the two halves do not match
- Border — ragged, notched or blurred edges
- Colour — several shades or uneven colour
- Diameter — larger than about 6 mm, though melanomas can be smaller
- Evolving — any change in size, shape, colour, itching or bleeding
Also seek advice for: a sore or spot that does not heal within a few weeks; a rash with fever or feeling unwell; skin that is hot, spreading, painful and red, which can suggest infection; blistering after a new product or medication; sudden hair loss with scalp changes; and any rash in a baby that does not fade when a glass is pressed against it.
How to prepare for an appointment
Take clear photos of the problem over several days, in daylight. List every product you use, including the full ingredient lists if possible, and any medications or supplements. Note when the problem started and what makes it better or worse. Avoid starting new products in the days before you are seen, so the doctor sees your skin as it really is.
Why routines still matter
Even when treatment is medical, a gentle routine helps. Many prescription creams for acne and rosacea cause dryness, and a plain moisturiser and sunscreen improve tolerance. Eczema treatment plans almost always include frequent emollients. Think of your routine as the supporting cast and prescribed treatment as the lead.
Reliable sources
For trustworthy reading, we suggest the NHS website, the British Association of Dermatologists, the American Academy of Dermatology and DermNet. Questions you would like us to explain? Write to the notebook.
Online photos are not diagnoses
Many conditions look alike on a screen. A trained eye, sometimes with a dermatoscope, sees far more. Use what you read here to ask better questions, not to replace the answer.