Twelve days after breast cancer resection, the drainage tube was not pulled out, and blood flowed out every day. This is normal, because the incision and wound of breast cancer resection are relatively large, and there is a lot of subcutaneous bleeding. So you don't have to worry too much. After breast cancer resection, pressure bandaging, regular local dressing changes, active anti-inflammatory and hemostatic treatment are generally required to prevent wound flap necrosis.