Surgeons routinely place drains after breast cancer surgery to drain lymphatic fluid and intraoperative blood and fluid accumulation to facilitate wound healing. When the drainage tube drains <20ml per day or the drainage fluid is clear, the drainage tube can be considered to be removed. If the drainage tube is prematurely removed or inadvertently dislodged, it may cause subcutaneous fluid accumulation residual, which is not conducive to wound healing and even leads to flap necrosis. In this case, the wound can be treated by applying pressure to the wound, extracting the residual fluid if necessary, or even repositioning the drainage tube.