Itchy skin scratching red small particles, consider and allergy, urticaria, eczema-like dermatitis and other factors related. It is recommended to pay attention to the care of the skin, external anti-itch, glucocorticoid drugs, if necessary, with oral antihistamine, immunity regulating drugs treatment. 1. Allergy: Allergy is related to skin contact, inhalation, consumption of allergens, resulting in allergic reactions, which may lead to itchy skin, pimples and papules when scratching. It is recommended to detach from the allergens, apply glycerite lotion externally, and take oral loratadine, levocetirizine hydrochloride and other medications if necessary. 2. Urticaria: The cause of urticaria is more difficult to determine, and is considered to be related to life history, changes in the living environment, medical history, food, drugs and other factors. It causes the skin to appear windy, erythematous and itchy. Olopatadine hydrochloride, cetirizine hydrochloride can be given, if necessary with dexamethasone, prednisone and other glucocorticoid drugs. 3. Eczema-like dermatitis: Eczema-like dermatitis is related to bacterial infection, which may lead to allergic reaction and itchy skin papules. Determined to be caused by bacterial infection, can be given erythromycin, neomycin, if necessary, with vitamin C, calcium gluconate, loratadine, prednisone and other drugs treatment. Itchy skin scratching red particles, it is recommended to pay attention to skin care, avoid scratching induced infection, if necessary, to the hospital dermatology department, looking for the cause, for the cause of the treatment of the doctor’s orders, do not self-medication.