DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Lichen planus of the mouth. Close-up of lesions in the mouth of a 33-year-old female patient with by 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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