What should you know about red marks on skin?

A flat, itchy area after contact with a product or fabric can fit contact dermatitis. Heat and sweat may produce prickly patches, while sun exposure can cause sunburn. Recurrent facial flushing may occur with rosacea. Thickened, scaly plaques can occur with psoriasis. Redness that is hot, painful, swollen, and spreading can occur with cellulitis and needs medical assessment. The same colour can appear in different conditions, so location, texture, sensation, timing, and associated symptoms are more useful than colour alone.

Take a clear photograph and note when the marks began, what touched the skin, and whether heat, sun, or a medicine preceded them. Wash gently, avoid scratching, and pause suspected irritants. A cool compress may soothe warmth; keep sun-exposed skin covered and moisturised. Do not apply leftover steroid or antibiotic creams without guidance, because the wrong product can mask or worsen some rashes. A clinician can identify the pattern and discuss options such as a treatment for the underlying condition or, for selected persistent redness, IPL Photofacial.

Seek same-day medical advice if redness is spreading, hot, painful, swollen, blistered, draining, or accompanied by fever. Urgent help is needed for breathing difficulty, facial or tongue swelling, confusion, faintness, or rapidly worsening illness. Arrange a routine review when marks persist, recur without a clear trigger, or develop a changing surface.

Ask whether the appearance fits contact dermatitis, heat rash, sunburn, psoriasis, rosacea, cellulitis, or another cause; which products to stop; and whether testing or treatment is appropriate.