Since the beginning of summer, the weather is getting hotter and hotter, and the dermatology clinic is getting busier and busier, and more than 1/3 of the patients have dermatitis related to summer humidity and heat! Experts warn that the summer months are a good time for dermatitis, often causing itching that affects the patient’s work and sleep, and if not treated in a timely manner, comorbidities may occur. Heat-excited dermatitis, the most clearly related to summer weather conditions, is a skin disease. The main manifestation is a red, corn-like papule with pronounced itching, scratch marks, blood scabs, skin hypertrophy and hyperpigmentation, which occurs in adults on the trunk as well as the inner extremities, and improves significantly when the temperature drops. The culprit is sweat! The concentration of metabolic wastes in sweat has a lot to do with the severity of the symptoms of the disease. The composition of sweat is similar to urine, containing a large number of metabolic wastes of human tissues, such as urea, uric acid, lactic acid, sodium chloride, etc. These metabolic wastes are acidic and have a strong irritating effect on the skin. The metabolic waste content in sweat is the highest when the body sweats moderately, and it is most likely to cause at this time. The experts reminded that the prevention of heat-excited dermatitis, clothing to pay attention to ventilation, absorb sweat, and often wash sweat with warm water. You should also drink more water to dilute the harmful ingredients in the sweat. Insect bite dermatitis, is another common summer dermatitis. The cause is mainly due to the mites on the summer sleeping pillow bamboo mat. To prevent this dermatitis, it is best to scald the mat with boiling water before use, and then put it in the sun after washing; if it is the popular “mahjong mat” on the market, it is not suitable for scalding with boiling water, and can be thoroughly washed with water and then exposed to the sun. Experts remind, some people to the mat spray insecticide practice is not desirable, because the insecticide may cause skin absorption of chemicals and allergies. In addition, keep the humidity in the bedroom not too high, because the favorite growing environment for mites and others is a hot and humid environment. Infectious dermatitis is also common in the summer. Due to the high temperature and humidity, skin impregnation causes blockage of sweat holes, etc., are prone to the invasion of pathogenic bacteria to reproduce on the skin. These skin diseases can be transmitted by contact or self-infection, and are painful and itchy, with fever and swollen lymph nodes in severe cases. Prevention begins with keeping the skin clean, bathing regularly, clipping nails, and sprinkling prickly heat powder in the folds of the skin after showering to keep the skin fresh and dry. Pay attention to indoor ventilation and coolness. Do not treat dermatitis indiscriminately, but under the guidance of a doctor, treat it with topical rubs or oral medication. Be sure not to scald the affected area with hot water to stop the itching. Hot water scalding will make the subcutaneous blood vessels more dilated, redness and swelling will increase, and exudation will increase, which is not good for recovery.