There will be many kinds of back pack, according to the different cases of symptomatic treatment, there are the following cases: 1, back red pack to pain and itch mainly, in the top of the pack can be seen white pus head, consider is folliculitis, and usually do not pay attention to hygiene, eat spicy, greasy food too much related, with clindamycin gel, erythromycin ointment, etc. coated with the affected area, diligent bath, diligent change of clothes to keep the skin clean; 2, pack color and 2, the bag color and normal skin color or brown, slightly elevated under the skin, smooth surface, can be pushed by hand to consider the epidermal cyst, when the cyst secondary infection can appear red, swollen, pain, pus symptoms, if no symptoms do not need treatment, the symptoms of infection, the need for surgery to cut open the cyst drainage; 3, the back of the bag to red, swollen, pain as the main symptoms, after 3 days or so, the central part of the bag, pus head and the bag will Some of them can break by themselves, and after the rupture, the pus is discharged and the symptoms of pain and redness disappear, and the wound heals by itself and the pack disappears, which is a boil.