There are many reasons why ears itch when exposed to the sun, common causes include ear skin sensitivity, ultraviolet light allergy, ear skin sunburn and so on. Ear skin sensitivity, allergic to ultraviolet light, clinically known as photosensitive dermatitis, is ultraviolet light on human skin caused by phototoxic skin inflammatory reaction disease. May appear erythema, papules, papules, conscious burning, tingling or itching and other symptoms. Itchy ears sunburn may also be strong or too long sunburn caused by sunburn, clinically known as solar dermatitis, manifested as sunburn sites appear clear border bright red erythema, accompanied by burning, tingling, itching and other symptoms. Itchy ears in the sun can also be seen in other causes, it is recommended that the symptoms of timely hospital treatment, usually recommended to do a good job of sun protection.