Hard lumps above the incision of cesarean section can be caused by local infection, fat liquefaction, surgical thread knots and other factors. 1. Local infection: when infection occurs at the incision after cesarean section, red and swollen hard nodules may appear locally, local skin temperature rises, and pressure and pain may appear, so it is necessary to actively deal with the wound infection, and change the medication regularly, so as to avoid serious consequences caused by the wound infection. 2. Fat liquefaction: after fat liquefaction occurs in the incision of C-section, if the wound drainage is not smooth, the liquefied fat may form hard lumps when it accumulates too much locally, and the wound should be opened and drained in time to avoid the accumulation of liquefied fat. 3. Surgical thread knot: too tight during the operation in the incision area knot, can cause the local soft tissue extrusion accumulation, resulting in the local appearance of hard lumps. Or, due to the rejection reaction of the thread knot in the wound, local inflammatory changes can also occur, and hard nodules can also appear. When hard lumps appear above the C-section incision, they should be handled promptly by the doctor after clarifying the cause of the disease, which will help to relieve the uncomfortable symptoms at an early stage.