There are a lot of small bumps on the back that do not hurt or itch, considering seborrheic keratosis, Malassezia folliculitis, etc., you should choose the appropriate treatment according to the specific disease, mainly medication, physical therapy and so on. 1. Seborrheic keratosis: this is a relatively common benign epidermal tumors, generally do not need special treatment, if you think it affects the aesthetics of the physical methods of laser, freezing and other treatments. 2. Malassezia folliculitis: back hair follicle parts of Malassezia infection can cause folliculitis, you can use ketoconazole lotion or selenium dioxide lotion and other baths, usually coated with ketoconazole cream and other medications, if the symptoms are serious need to be taken orally, such as terbinafine and other antifungal drugs. There are a lot of small bumps on the back does not hurt, itchy, it is recommended that the correct treatment under the guidance of a doctor, the above drugs should be used in accordance with the doctor’s instructions, do not blindly use their own.