It is recommended to use an ointment called "kelo-cote (Chinese name: Barker)", which is made in the United States and is very famous. It has a clear effect on treating abnormal scars (such as hypertrophic scars you mentioned). Everyone in the Plastic Post Bar knows this. Taobao or plastic surgery hospitals sell them, each for several hundred dollars. At least 2 months can see the effect. If the scar is obviously improved after 2 months, continue to use it. After a few months, the scar can be removed.