Boils belong to inflammatory changes secondary to bacterial infection. Usually, after suppuration, pus flows out with it after squeezing, but it may leave deep pits in the area. Some bacteria usually remain inside, and subsequent disinfection should be carried out to prevent infection. Treatment can be chosen according to the size of the deep pit: 1. Smaller pits: If the pits left are small, anti-inflammatory creams such as fusidic acid cream and mupirocin ointment can be used for application. Generally a period of regular medication will gradually recover, may also leave scars; 2, pits larger: If the pits are deeper and larger, the clinical may need to use Vaseline oil gauze or Esaacrine lactate to fill deep pits. It is necessary to wait for the wound to heal before the next treatment, and usually the subsequent application of semiconductor laser will help deep pits to recover. It is important to avoid spicy food, alcohol and water, and to avoid squeezing the wound again with hands. If after a period of time, there is still no improvement, or even the pits continue to expand and deepen, or even symptoms of infection, such as ulceration, pus, etc., you should promptly visit the hospital and adjust the treatment plan.