DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Thumbnail with lichen planus disease. Close-up of the thumb of a 55-year-old man with lichen planus, showing a fungal-like irregularity of the nail. This condition affects middle-aged adults, but it 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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