When the wound is deeper and involves the dermis layer of the skin, or bleeding or infection occurs during the healing process, it is easy to lead to localized scarring; and keloid patients will have scarring after the injury has healed. After the skin injury, the body occurs in the process of repair, fibroblasts, as well as inflammatory cells and capillary hyperplasia led to the formation of scar, which is a normal physiological process. Generally speaking, as long as the skin injury reaches the dermis, no matter what measures are taken, scar formation will definitely occur after the skin injury heals. In addition, when bleeding, infection and other undesirable factors that cause delayed wound healing occur during the healing process, they can also stimulate the production of keloid scars. People with keloid scarring will form a noticeably proliferating scar after a skin injury, even if it is a mosquito bite, and will be accompanied by symptoms such as itching and pain. There are different treatment options for keloid scars depending on the specific condition of the scar, and it is recommended that patients who wish to have treatment go to a regular medical institution in a timely manner, and follow the advice of the specialist to choose the appropriate treatment method.