DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Close-up of psoriasis on the skin around the anus (perianal) of an adult male patient, after three weeks of treatment with a topical steroid. Psoriasis is a skin condition where excessive growth of skin cells can lead to itchy, scaly, thickened patches (plaques) of skin. Psoriasis can be triggered by emotional stress, infections or drugs, or the cause may be unknown.
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