DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Toenails with lichen planus disease. Close-up of the toes of a 50 year old woman with lichen planus, showing a fungal-like irregularity in the nails. 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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