A piece of small bumps on the arm is considered to be keratosis pilaris, eczema, folliculitis, etc., can be based on the specific cause of the drug treatment. 1. Keratosis pilaris: Keratosis pilaris is a chronic follicular keratosis skin disease, you can apply retinoic acid cream, tazarotene gel, salicylic acid ointment, etc. to dissolve the keratin and improve the symptoms. 2. Eczema: Eczema is a chronic itchy skin disease caused by a variety of reasons, you can choose glucocorticoid ointment application treatment, such as dexamethasone cream, mometasone furoate cream. For the face and other weak parts of the skin, you can choose tacrolimus, pimecrolimus and other drugs. 3. Folliculitis: Folliculitis is an inflammation caused by bacteria invading the hair follicles, you can apply antibiotic drugs such as mupirocin ointment, and pay attention to keep the local skin clean and hygienic. If there is a piece of a small bumps on the arm symptoms, it is recommended to go to the hospital in time, early formal treatment, specific drugs need to follow the doctor’s instructions, to avoid blind use of drugs.