The redness of the wound after three months of minimally invasive surgery may be caused by wound infection and scar proliferation. 1. Wound infection: due to the unclean environment after surgery, improper treatment of exudate, repeated injuries and other reasons leading to the wound bacteria, viruses and other microbial infections, there may be redness and swelling of the wound, elevated skin temperature, tenderness and other symptoms. 2. Keloid hyperplasia: After the skin surface is stimulated by trauma or surgery, fibroblasts proliferate excessively while the skin is healing, resulting in a proliferative change, which may appear as flesh-colored reddish, pink or brown. If the wound is still red after three months of minimally invasive surgery, it is recommended to go to a professional hospital and do relevant examinations to clarify the cause.