What is the name of a thick scaly patch of skin, common in fair-skinned individuals with sun exposure?

Actinic keratosis is the correct term for a thick, scaly patch of skin that often appears in fair-skinned individuals who have had significant sun exposure. This condition results from prolonged ultraviolet (UV) radiation damage, which leads to changes in the skin's cells. Actinic keratosis is characterized by rough, dry, or scaly patches that can develop into skin cancer if not treated, making early recognition and management important.

In the context of sun exposure, actinic keratosis serves as a warning sign that the skin has suffered damage, and its presence indicates a heightened risk for skin malignancies. Unlike psoriasis, which is an autoimmune condition resulting in red, inflamed patches with silvery scales, or eczema, which is characterized by itchy and inflamed skin, actinic keratosis is directly linked to UV exposure. Keratosis is a broader term that encompasses various forms of skin thickening, but actinic keratosis specifically refers to those related to sun damage, setting it apart from other types.