Pimples on arms may be acne, folliculitis, etc. Sulfur soap is not a drug and is not recommended as a regular recommendation for disease treatment. 1. Acne: Acne is a chronic inflammatory follicular sebaceous gland disease, resulting in inflammatory pimples and pustules on the face and neck, forehead and back, shoulders and other parts of the body. You can use topical adapalene gel, retinoic acid ointment, fusidic acid ointment and so on. If necessary, with oral doxycycline, minocycline, isotretinoin and other treatment. 2. Folliculitis: Folliculitis is an inflammation caused by bacterial infection of the hair follicle, resulting in the appearance of single or multiple red papules. It is recommended to do a good job of local care, topical mupirocin ointment and other medications. Sulfur soap is a soap containing sulfur, which is a series of skin care products and has a preventive effect on some skin problems. However, sulfur soap is not a drug and cannot be used as a medication to treat diseases. Arm acne, a long time can not subside or further aggravation of the symptoms, if necessary, to the hospital dermatology consultation, under the guidance of the doctor standardized treatment, the specific use of drugs need to follow the doctor’s instructions.