Keratosis (from kerat- + -osis)^[1] 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

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Keratosis
Upper arm showing keratosis pilaris
Specialty	Dermatology, medical genetics

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• Folliculitis
• Keratoderma