Summer dermatitis, also known as summer dermatitis, is a common disease in summer, which is caused by the continuous high temperature and high humidity of the external environment, coupled with the skin sweating and not timely cleaning caused by skin inflammation. The cause and pathogenesis of sweating is the main channel of heat dissipation and excretion of the body in summer. These inorganic salts and organic substances are not normally present on the surface of the skin, when the water evaporates, these will remain on the skin, the amount of a lot, a long time, it will form an irritation to the skin, resulting in skin inflammation. The typical symptoms occur on the extensor side of the limbs, especially on the front of the lower legs, and are symmetrical. It starts as corn-sized, relatively dense erythema, papules or papular blisters, with marked itching and burning sensation. The itch is unbearable and scratching often results in streaks of scratching and scabbing, leaving hyperpigmentation after fading. The topical medications used to treat summer dermatitis: Eloson cream, Eudrag cream, Dermapen, AoN, etc.; oral antihistamines: paracetamol, loratadine, cetirizine, etc. Precautions: 1, should not wear non-breathable clothing and pants, preferably wearing cotton and linen or silk and other all-natural clothing and pants. 2, you can often wash the affected area with warm and cool water, do not use hot water to wash the affected area in order to stop itching. 3, summer to drink more water, and should not drink more sugary drinks, drink more water can dilute the concentration of chemical components in sweat. 4. Stay in a cool and ventilated place as much as possible in hot weather and avoid going out frequently. When going out, no matter cloudy or sunny, it is best to use a black sunshade to block the light, because black can absorb various wavelengths of ultraviolet light to block the UV damage to the skin. 5, humid and hot season can be enabled to dehumidify the air conditioner to avoid excessive body sweating.