Most hard packs on the back are boils, carbuncles or sebaceous cysts with infection. In these cases, the first step is to use sensitive antimicrobial drugs. Antimicrobials such as penicillin or cephalosporins are often used against gram-positive cocci. In the early stages of a boil or carbuncle, magnesium sulfate or ichthyolite ointment can be applied locally as a wet compress. If there is a pus plug in the boil, a sterile razor blade or needle can be used to pick out the pus plug to promote the drainage of pus. For carbuncle or sebaceous cyst infection forming abscess, timely incision and drainage, especially for carbuncle, the incision should reach the border of redness and swelling, the incision should be as large as possible, to fully remove necrotic and infected tissues in the body, the application of hydrogen peroxide, iodine vapour and physiological saline, repeated rinsing of wounds to clean, the trauma can be filled with Vaseline gauze, and daily dressing change, to enhance the removal of local necrotic tissues, and wait for the growth of granulation tissue. Waiting for the growth of granulation tissue, can be applied locally high sugar or Befuzi spray to promote the growth of the wound.