The cause of acne on the arms is mainly due to the follicle sebaceous glands secrete more sebum, the follicle mouth is relatively narrow, the contents can not be discharged, accumulation in the hair follicle formation. You can use lifestyle adjustment, medication and other ways to alleviate. 1. Lifestyle adjustment: pay attention to a light diet, do not eat too much spicy and greasy food and sweets, so as not to stimulate the secretion of sebum from the hair follicles, inducing acne. Also pay attention to the regularity of life, do not stay up late, so as not to cause endocrine disorders in the body, easy to cause skin acne. Use warm water and neutral soap to clean the skin, reduce the oil sticking to the skin to block the pores. 2. Medication: Do not squeeze the acne that has appeared, so as not to cause infection. You can follow the doctor’s instructions to use topical retinoic acid ointment, adapalene gel and other treatments. It can gradually restore the smoothness of acne follicles and inhibit the follicles from secreting sebum. When acne is more serious, it is recommended to consult a doctor in time and have targeted treatment or therapy.