About-Actinic keratosisalso known as solar keratosis is a pre-cancerous patch of thick, scaly, or crusty skin caused by damage from years of sun exposure.
Symptoms- Actinic keratosis is found primarily on skin that is exposed to the sun, suchas the face, forearms, lips, ears, hands, scalp, neck, and lower leg.
The patches can be:
Red, pink, brown or skin-colored
Rough, dry, or scaly
A hard, wart-like surface
Itchy skin
Causes-
Frequent or intense exposure to UV rays
Complications
If left untreated, some of these spots may progress to squamous cell carcinoma
Red, pink, brown or skin-colored 
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Dermatologist
