Actinic keratosis: An actinic keratosis (ak), also known as a solar keratosis, is a small, rough spot occurring on skin that has been chronically exposed to the sun. Actinic keratoses generally measure in size between 2-6 millimeters in diameter (between the size of a pencil point and that of an eraser). They are usually reddish in color, with a rough texture and often have a white or yellowish scale on top.
Answered 1/25/2013
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Many possibilities: It could be any of many diseases such as lupus, acne rosacea, etc.
Answered 3/6/2019
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