DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Lichen planus of the mouth. Close-up of lesions on the tongue of a 72-year-old female patient with lichen planus. This condition tends to affect middle-aged adults but has no known 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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