actinic keratosis

Actinic keratosis (also called solar keratosis, or AK) is a premalignant condition of thick, scaly, or crusty patches of skin. It is most common in fair-skinned people who are frequently exposed to the sun, because their pigment isn't very protective. It usually is accompanied by solar damage. Since some of these pre-cancers progress to squamous cell carcinoma, they should be treated.
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Actinic keratosis n. A warty lesion, often premalignant, occurring on the sun-exposed skin of the face or hands, especially of light-skinned persons. [more]Actinic keratosis - Community and Resources

Noun
1. an overgrowth of skin layers resulting from extended exposure to the sun
(hypernym) keratosis

A precancerous condition of thick and scaly patches of skin; also called solar or senile keratosis.

[ak-TIN-ik ker-a-TOE-sis]
A precancerous condition of thick, scaly patches of skin. Also called solar or senile keratosis.