DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Hyperkeratosis. Close-up of a dilated hair follicle on the nose of a 72-year-old male patient, showing hyperkeratosis (thickening) and underlying chronic inflammation. Hyperkeratosis is a thickening of the skin caused by an overproduction of keratin proteins in the skin.
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