Solar keratoses occur on sites exposed to the sun and are more common in those who have worked out of doors or sunbathed excessively. The common sites are the face, back of the hands,
Solar keratoses arms, and legs. They also develop on the scalp in bald men and on the lips, particularly in pipe smokers. They show alterations in keratinisation and have the potential to become dysplastic and eventually develop into squamous cell carcinoma, a change often preceded by inflammation. They can be regarded as squamous cell carcinoma grade 1/2.
The clinical appearance varies from a rough area of skin to a raised keratotic lesion. The edge is irregular and they are usually less than 1 cm in diameter. Inflammation and tenderness may be associated with progression to carcinoma.
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