Summer dermatitis lesions start as pinpoint-sized erythematous spots and papules, followed by papular herpes, and after scratching, lines of epidermal cuts and blood crusts and pigmentation are visible. There is no vesiculation or exudation during the entire course of the disease. When the temperature is high and the humidity is high, the lesions are aggravated, and then the symptoms are relieved and the rash gradually subsides with cooler weather. The lesions are mainly located on the extensor side of the extremities, with the anterior shin of both lower extremities being the most common. It is more common in adults over 30 years of age, more common in women, and more likely to occur in those who work in hot environments. There is a self-induced itching sensation. Summer dermatitis should pay attention to environmental ventilation and heat dissipation, avoid wearing non-breathable clothing, pay attention to personal hygiene, and keep the skin dry. The affected area can be coated with glyburide lotion, and those with significant itching can take oral antihistamines.