Three months after lung nodule surgery, the wound still has blood and water, which may be caused by local infection, thread reaction, fat liquefaction and other reasons. 1. Local infection: three months after lung nodule surgery, there is still blood in the wound, which may be caused by not paying attention to hygiene, bacterial and viral invasion and other causes of local infection, so there may be local pain, redness, bleeding, pus and other symptoms. 2. Nodal reaction: lung nodule surgery three months wound and blood may be the result of nodal reaction, the deep wound nodes can not be absorbed to repeatedly stimulate the local tissues, resulting in local non-healing, so there will be the symptom of blood and water in the wound. 3. Fat liquefaction: generally due to hypertrophic adipose tissue with poor blood flow, or the occurrence of degeneration and other causes of aseptic necrosis, resulting in yellow oily ooze, if there is a newborn granulation tissue around the wound can be seen when changing the wound with blood and water appeared. It is recommended that patients should be treated under the guidance of the doctor, do not blindly use drugs, so as not to cause adverse reactions.