Actinic keratosis is caused by damage to the surface cells of the skin. Keratinocytes are damaged by ultraviolet (UV) radiation with development of keratotic lesions . These transformations can affect the scalp, the face , the neck , the hands or the arms.
This pathology is manifested by small patches of variable colors (flesh color, brown, red or even white) and of rigorous texture . Actinic keratoses are often more easily detected by touch than by sight. Affected skin may experience roughness and dryness, but also increased tenderness, pain, itching, and a burning or stinging sensation.
Actinic keratosis preferentially affects subjects with a clear phototype, as well as those with a history of excessive and unprotected exposure to UV rays from the sun or artificial tanning booths .