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Note: Medical terms used during the late 19th and early 20th centuries may differ from those found in contemporary medicine. Images were scanned and processed by OMS staff members from old medical textbooks that are in the public domain. Caution: Some images of medical diseases, conditions, and illnesses may be disturbing to viewers, and are not suitable for children.

Keratosis Pictures

Definition: Keratosis (plural is keratoses), is a skin condition characterized by an overgrowth of horny skin layers. There are 3 major kinds of keratosis. Actinic Keratosis: Overgrowth of outer skin layers caused by long-term overexposure to the Sun. Keratosis Follicularis: Uncommon hereditary disorder characterized by dark, sometimes purulent (containing pus) patches. Treatment includes vitamin A orally and topically, and sometimes with corticosteroids. Seborrheic Keratosis: Condition marked by well-curcumscribed wartlike lesions that are often itchy and covered with a greasy crust and occur most often on the face, neck, upper chest, and upper back. Treatment is by curettage, cyrotheraphy, or electrodesication.

Keratosis on the palm and inner fingers

Keratosis follicularis (same individual as in bottom two pictures)

Keratosis follicularis

Keratosis Follicularis

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Historical Sources (Bibliography)

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