Drainage port healing is still empty inside, is due to the drainage tube at the mouth of the pseudo-healing. In most cases, the placement of drains after surgery is due to the presence of infected foci or surgical wounds with a lot of exudate, which plays a role in draining the fluid from the chest cavity or abdominopelvic cavity and other interstitial spaces, to avoid the aggregation of infections, and at the same time, the exudate will also seep out along the periphery of the drain tube and collect in the subcutaneous muscle tissue. If the fluid in the subcutaneous muscle tissue is not adequately drained after the drain is removed, the skin will heal and the subcutaneous fluid will form a cavity or even become infected, so gauze strips need to be placed to drain the drain as appropriate when the drain is removed. If there is a cavity where the drain is placed, it is necessary to change the medication in time, open the epidermis, and clear and drain the wound to promote healing.