Scars on the chest are considered to be trauma, localized infections, keloid, etc. 1. Trauma: the skin damage caused by various types of trauma in the chest area, due to the thin subcutaneous tissue in this area, the skin tension is greater, so the healing will leave more obvious proliferative scar. If bleeding, infection and other delayed healing occurs during the recovery period, it will aggravate the scar proliferation. 2. Infection: some people are prone to folliculitis, acne and other local infections in the chest area, which will lead to damage to the lower dermis, so that the epidermis can not regenerate, and will fill in the defect through the proliferation of granulation tissue, and after healing, it will leave more obvious hyperplastic keloid scars, and some of them have keloid scars that erode the surrounding normal tissues. 3. Keloid: Keloid is a rare clinical special body type, this body type of patients, any skin damage to the skin connective tissue will be overgrowth, generally hard, prominent in the skin surface scar tissue, and will be eroded to the surrounding normal tissue to appear keloid. Chest keloid, if you think it affects aesthetics or continues to proliferate, it is recommended to go to a regular hospital to receive treatment, you can reduce the scar through drugs, surgery, photoelectricity and other methods.