Summer dermatitis is the most common consideration on this day. Summer dermatitis is a seasonal inflammatory skin disease caused by high temperature in summer. Most of them are related to continuous high temperature, sultry and high humidity. It is common in adults and women, and often involves the flexion of limbs and trunk, especially the anterior part of bilateral tibia, which is symmetrically distributed. At the beginning, it was needle-like erythema and papules, and then herpes papules were seen. Self-conscious itching, scratching, scab, skin hypertrophy and pigmentation after scratching, no erosion and exudation. When the weather is cold, it will fade. The main treatment is ventilation and cooling, and local drugs such as calamine lotion can be used, as well as weak glucocorticoid such as 1% hydrocortisone. In severe cases, antihistamines such as cetirizine can be taken orally.