Hot weather itchy legs may be summer dermatitis, papular urticaria and other diseases, can be treated by topical application of glycerite lotion, glucocorticoid drugs, oral antihistamines and other treatments, daily attention to personal protection. 1. Summer dermatitis: a seasonal, inflammatory skin disease caused by high temperature in summer, can be manifested as bilateral tibial skin itching, erythema, papules, papules and other damages, can be localized topical application of glycerite lotion, glucocorticosteroids such as hydrocortisone butyrate, itching is recommended that oral antihistamines such as chlortetracycline when significant. 2. Papular urticaria: associated with mosquito bites, can lead to the leg bites appeared on the hairy wind ball like papules, papules and so on. It is recommended to apply local dexamethasone ointment and other glucocorticoid drugs, oral antihistamines, and prohibit scratching the itchy place to avoid secondary infection. In summer, we should pay attention to cooling and ventilation, wear loose and breathable clothing, and wash the skin diligently to avoid sweating and keep clean and dry. Once itchy symptoms occur, it is recommended to go to the hospital to consult a professional doctor and follow the doctor’s instructions to use medication to avoid delaying the condition.