The itchy red heap on the legs, which is the appearance of more red bumps on the skin of the legs with itching, is usually considered to be caused by insect bite dermatitis, allergic dermatitis, urticaria and other skin diseases, and should be treated actively after identifying the cause. 1, insect bite dermatitis: mostly related to mosquito bites, manifested as a number of light red papules, hard texture, due to itchy after scratching will form a wind cluster. You can use furnace glycolic lotion with antihistamines, avoid scratching with your hands to avoid infection; 2. Allergic dermatitis: may be related to skin contact with exogenous substances, can appear multiple skin rashes and itching. Treatment can be alleviated with glucocorticoids, antihistamines, but the fundamental measure is to find the allergen so as to carry out the causal treatment; 3, urticaria: mainly related to food allergies, external stimuli and other reasons, disease attacks can lead to the sudden appearance of red wind clusters on the whole body or legs, accompanied by itching, it is recommended that patients use antihistamines for treatment, such as cetirizine, loratadine, etc.