DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Chronic plaque psoriasis on a 41-year-old man's elbow. Psoriasis is a chronic dermatological condition where excessive growth can lead to scaly, thickened patches of skin. It is often stress-related, though sometimes no cause can be found. It can be treated with drugs or phototherapy, though the condition often recurs.
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