How to remove scars on the arm, to distinguish the size of the scars: 1, if the scars are small or not long, you can use some topical drugs, such as mucopolysaccharide polysulfate or human-like collagen silicone gel, both have the effect of treating scars. 2, you can take some drugs orally, such as trinostat, which has the effect of anti-proliferation and anti-itching. 3, you can use the method of local injection drugs, such as compound betamethasone 4.You can use fractional carbon dioxide laser treatment, which is currently considered to be the first choice for scar treatment. Its main mechanism is to treat scars by normalizing collagen rearrangement through wound healing. Generally 3-4 months need to be treated once, and 3-5 times of treatment are needed. 5.If the scar is very large, it may need surgical excision, plus some radiotherapy, and these methods sometimes need to be used in combination.