concept

Human hair

Split end of a human hair

Hyperkeratosis of hand

Hyperkeratosis of the heel. Hyperkeratosis describes a thickening of the outer layer of the skin caused by abnormally increased amounts of the protein keratin which normally functions to protect the skin.

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Keratin

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Human hair

Hyperkeratosis of the heel. Hyperkeratosis describes a thickening of the outer layer of the skin caused by abnormally increased amounts of the protein keratin which normally functions to protect the skin.

Hyperkeratosis of hand

Split end of a human hair