after exposure, the most evident acute feature of UV radiation exposure is erythema (redness or sunburn). ➢ () (vasodilation), inflammation, systemic symptoms ➢ () response serves to augment the protective effects of melanin in the skin. ─ Pigmentary changes such as reckling and hypomelanotic areas, wrinkling, telangiectasias (Fine supercial blood vessels), actinic keratoses (precancerous lesions), and malignant skin lesions such as basal and squamous cell carcinomasand malignant melanomas are all consequences of chronic exposure to ultraviolet light exposure.