Shallow depressed scars that are more than ten years old can be treated directly with ion beam, while deeper depressed scars are not well treated with ion beam. Ion beam has the effect of localized microwave removal, which can stimulate collagen renewal and promote the repair of depressed scars. For depressed scars over ten years old, if it is shallow, it can be treated directly with ion beam; if the scar is deeper, the ion beam treatment effect is not good. When depressed scars over ten years old need to be treated with ion beam, they need to go to a regular professional medical institution and be operated by a professional doctor in order to achieve good results. For deeper depressed scars, they can be treated with a combination of skin resurfacing, fruit acid peeling, fractional laser and other medical technology. It is recommended that when you want to treat depressed scars that are more than ten years old, you can first go to a regular hospital for examination and follow the doctor’s instructions for treatment.