A lot of small acne-like pimples on the back may be caused by acne, folliculitis and other diseases. It is recommended to pay attention to skin care, give antibiotic ointment, oral medication for treatment. 1. Acne: Acne, also known as pimples, tends to occur on the face and neck, forehead and back, resulting in localized pimples and inflammatory papules. In mild cases, topical medications such as fusidic acid ointment and adapalene gel can be applied. Medium and severe patients can take oral doxycycline, isotretinoin and other medications. 2. Folliculitis: Back folliculitis may be caused by bacterial or Malassezia infection, which may lead to localized rash, itching and pain. Bacterial folliculitis can be treated with topical antibiotic ointment, such as mupirocin ointment and other medications. Malassezia folliculitis needs to be treated with topical antifungal medications such as ketoconazole. The appearance of many acne-like pimples on the back is related to a variety of factors. It is recommended not to use drugs blindly, you can first go to the hospital dermatology department for examination, for the cause of the disease, under the guidance of the doctor to use drugs to treat.