Microneedling of hypertrophic scars and keloids destroys the rough collagen fibers appearance and reduces scar height. After microneedling in these places, new fibers are created, which are parallel to the skin surface. The more punctures, the more collagen fibers are destroyed. New collagen fibers formed in the punctures are parallel to the skin surface. This leads to a reduced size of the scar and an improvement in its elasticity