A small bump on the wrist is very itchy usually considered as insect bite dermatitis, eczema, sweat herpes and other causes, need to choose medication, personal care and other methods to solve. 1. insect bite dermatitis: you can follow the doctor’s advice to choose oral anti-allergy drugs, such as benadryl, imipramine, etc., to relieve itching and other symptoms, go out and do a good job of personal protection. 2. Eczema: you can follow the doctor’s advice to choose oral anti-allergy drugs, such as loratadine tablets, levocetirizine tablets, etc., to reduce the symptoms of allergy, pay attention to daily skin cleaning and hygiene, to avoid wet skin, scratching and so on, so as not to cause skin lesions. 3. Sweat herpes: you can follow the doctor’s instructions to choose the topical application of local antipruritic ointment, such as glycerine lotion, Dinaid cream, etc., to reduce the symptoms of discomfort. A small bump on the wrist is very itchy may also have other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment. The application of drugs need to strictly follow the doctor’s instructions, if there is discomfort can be discontinued to consult the doctor.