Belly small red bags and itchy and painful, need to be based on the cause of the use of medication, common causes include contact dermatitis, folliculitis. 1. Contact dermatitis: when the belly area skin contact with certain exogenous substances, such as clothing, detergents, etc., stimulate the skin or trigger an allergic reaction, thus triggering contact dermatitis, manifested in the skin surface erythema, edema, pimples, blisters and other symptoms, accompanied by itching, burning, swelling and pain and other manifestations. Local topical glucocorticoid ointment, such as mometasone furoate cream, hydrocortisone butyrate cream, etc., itching is obvious, at the same time, oral antihistamine drugs, such as loratadine tablets. 2. Folliculitis: when the hair follicles in the belly area are damaged, bacteria, fungi and other pathogens are easy to invade the hair follicles, thus triggering folliculitis, manifested as red papules or pustules on the skin surface, which may be accompanied by itching and pain. For bacterial infection, topical mupirocin ointment can be used; for fungal infection, topical ketoconazole cream can be used. All of the above drugs need to be used under the guidance of a professional doctor, avoid self-medication. The itchy and painful small red bags on the belly may also have other causes, it is recommended to go to the hospital in a timely manner to improve the examination, to clarify the cause of the disease to give targeted treatment.