Pus flowing from a powdery tumor means that the tumor has become infected and will not heal on its own. It is recommended to go to the hospital for surgical incision and drainage in a timely manner, especially for patients with large powdery tumors that have pus flowing, which is not easy to heal on its own. After the pus is discharged from the powdery tumor, the shunt may become smaller, so attention should be paid to anti-infection and local anti-inflammatory treatment. After the pus is discharged and the local inflammation is controlled, it is recommended that surgery be performed in a timely manner to remove the cystic wall of the powdery tumor and remove the surrounding inflammatory tissues as well, which can effectively prevent recurrence.