Regular hospitals have this kind of plastic surgery department, and there are instruments to treat it. The key is to see a doctor as soon as possible, find a regular hospital, and don't use drugs indiscriminately.

I heard that after laser scar removal, you can go to the hospital for consultation first. I think the key now is to calm your sister's mood. Emotional words are not conducive to the recovery of the wound. Now that medicine is flourishing, you must be confident that it can be cured.

I wish your sister a speedy recovery!