Redness of the scar after thyroid cancer surgery needs to be considered if there is inflammation of the incision. Inflammation of the incision will lead to redness of the scar. If the scar is red and hard, itchy and protrudes from the surface of the skin, you need to be alert to the possibility of scar hyperplasia, which is closely related to the individual’s physical condition. After thyroid cancer surgery, it is advisable to have a light diet, avoid spicy and stimulating food, do not touch or scratch the wound frequently, and pay attention to the daily cleaning and care of the surgical site. If the above symptoms occur, go to the hospital in time, and if necessary, sterilize the wound under the operation of the doctor as well as take antibiotics for treatment. Scar hyperplasia can be treated by means of radiation and laser.