Summer weather is hot, sweaty, moist skin, easy to infect a variety of germs. In addition to the summer clothing thin, exposed parts of the skin more, the skin by the insect bites mosquito bites, is also one of the reasons for more skin diseases. Summer sunlight, hot climate, sometimes high humidity, will not only induce many skin diseases, but also make the original skin disease aggravation, common: ① photoreceptor skin disease. This is the body’s strong reaction to the sun caused by the more fair skin, light-sensitive organism, or ingestion of photosensitive substances such as certain drugs, sunlight for a longer period of time irradiated in the exposed skin, the back of the hand, facial redness and swelling, blisters can occur in the worst cases, usually called photosensitive dermatitis, in addition to lupus erythematosus, chloasma, freckles, etc., although it is not a photosensitive dermatosis, but can be aggravated by the sun exposure. Prevention is mainly to avoid photosensitive substances and direct sunlight. Treatment can take chloroquine, vitamin PP, C: and nicotinamide, antihistamines. ② Sweat disorder skin disease. In high heat temperatures.