The medical chitosan repair membrane "sufu" seems to be made in Wuhan, but it is usually used for patients shortly after operation. You've been in this situation for a long time. I don't know if it's still useful, but you can try.
Department of dermatology, the first hospital of medical university, you can go and see, where dermatology is very famous. It is not recommended to go to the so-called plastic surgery institutions, many of which are unqualified and deceptive.
good luck