DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Oral lichen planus. Close-up of the mouth of a 45 year old woman with lichen planus, seen as fungal-like white patches. 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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