Face injury for half a year and still a little swollen may be poor recovery, infection, kidney disease and other factors. 1. Poor recovery: improper care of the face after injury, such as prolonged extrusion or compression, may lead to the face wound continues to fail to heal, there will often be symptoms of swelling. 2. Infection: after the injury, during the recovery process, the wound site is repeatedly infected, due to inflammatory substances stimulation, there will often be symptoms of swelling, which may also be accompanied by pain, oozing, itching. 3. Kidney disease: face injury half a year still a little swollen, may have nothing to do with the injury, should be alert for kidney disease, such as glomerulonephritis, may also be accompanied by proteinuria, swelling of the lower limbs and other symptoms. The face is still a little swollen six months after the injury, it is recommended to consult a doctor for examination, to clarify the causes, and timely treatment.