DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Penis with lichen planus disease. Close-up of the groin of a 55-year-old man with lichen planus, seen as a rash-like inflammation on the penis. 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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