Why do I get a red diagnosis every year when the weather turns hot? Is there any solution?

This is a polymorphic solar rash and a photosensitive dermatitis. Avoid strong sunlight.

Polymorphic solar eruption is a special reaction to sunlight, and the cause is unknown. It is a common skin disease, which occurs in women and people who have been exposed to the sun irregularly. During the attack, red papules and irregular rashes appeared in the sunlight. These rashes are itchy and usually appear 30 minutes to several hours after sunbathing. Papules and erythema usually subside in a week or so. Especially in this case, people who continue to bask in the sun outdoors (avoiding strong ultraviolet rays is a period of time) will reduce their sensitivity to sunlight.