DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Lichen planus disease. Close-up of the skin of a 55-year-old man with lichen planus, showing inflamed rash-like lesions. This condition affects middle-aged adults but has an unknown cause. In some cases it may be of nervous or emotional origin (such as severe stress) but in others it may be an allergic reaction or due to drugs.
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