The placement of drains in mastitis patients with pus does not usually cause pain, but rather the placement of drains can effectively drain purulent or inflammatory exudate through the tubes to the outside of the body, which can effectively reduce the symptoms of mastitis such as swelling and pain. Therefore, for mastitis once the formation of purulent lesions, the drainage tube should be actively placed to drain adequately, which is conducive to the rapid recovery of mastitis, and the pus should be selected for bacterial culture and drug sensitivity testing, through the results of the experiment to select the appropriate sensitive antibiotics for intravenous injection, more conducive to the rapid relief and recovery of mastitis. The drainage tube can be removed at any time if there is no obvious exudation and the condition is gradually relieved.