keratosis

{{Short description|Growth of keratin on the skin or mucous membranes}}

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| name = Keratosis

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| image = Keratosis pilaris arm.jpg

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| caption = Upper arm showing keratosis pilaris

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Keratosis (from kerat- + -osis){{Citation |author=Merriam-Webster |author-link=Merriam-Webster |title=Merriam-Webster's Unabridged Dictionary |publisher=Merriam-Webster |url=http://unabridged.merriam-webster.com/unabridged/ |postscript=. |access-date=2018-03-28 |archive-date=2020-05-25 |archive-url=https://web.archive.org/web/20200525084504/https://unabridged.merriam-webster.com/subscriber/login?redirect_to=%2Funabridged%2F |url-status=dead }} is a growth of keratin on the skin or on mucous membranes stemming from keratinocytes, the prominent cell type in the epidermis. More specifically, it can refer to:

• actinic keratosis (also known as solar keratosis), a premalignant condition
• chronic scar keratosis
• hydrocarbon keratosis
• keratosis pilaris (KP, also known as follicular keratosis)
• seborrheic keratosis, not premalignant