Arm acne can be caused by diseases that manifest as “pimples”, including acanthosis nigricans, folliculitis, keratosis pilaris, etc. The treatment for elimination includes medication. 1. Acanthosis Nigricans: If arm acne is caused by a lack of vitamin A, you can take vitamin A, vitamin E and other medications orally. 2. Folliculitis: If the rash is caused by bacterial infection of the hair follicle, then you can give fusidic acid and other drugs to fight infection; if it is a fungal infection, you can use amorphophallus ointment and other drugs to fight fungal treatment. 3. peri-corneal keratosis: because of a variety of factors lead to abnormal keratinization of the skin centered on the hair follicle, at this time there will be arm acne, the treatment can be given to vitamin A and other drugs to exfoliate the treatment, the use of urea ointment and other topical moisturizing, if necessary, can be combined with the local topical salicylic acid and other treatments. Finally, the phenomenon of arm acne, please consult a doctor in time, the above drugs please follow the doctor’s advice.