BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Lichen planus. Light micrograph of a section through the epidermis (upper layer) of skin affected by lichen planus, showing hyperkeratosis (flaky), and thickening of the granular layer (lighter pink). Lichen planus is a clinically and histologically distinct form of dermatitis.
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