Scars two years and still itch may be caused by scar hyperplasia, local infection and so on. 1. Scar hyperplasia: scar formation is an important process and the main end of wound repair, scar hyperplasia is caused by excessive proliferation of fibrous connective tissue. Scar proliferation is caused by the overgrowth of fibrous connective tissue, which is mainly manifested as smooth stripes or irregular swellings on the surface of the skin, often accompanied by pain, itching, and affecting the growth of hair and other symptoms. 2. Local infection: If the scar is locally infected, it can cause local skin redness, swelling, elevated skin temperature, pain, accompanied by itching and pus and blood secretions and other symptoms. There are many other causes of itchy scars in two years, which should be emphasized, timely consultation, identify the cause of the disease, and follow the doctor’s instructions for further treatment or therapy.