There should not be a problem getting fat grafting if you are Hep B or even HIV positive as long as you are a good candidate
Im a Hep B Carrier Can I Still Get a Fat Transfer Procedure?
Doctor Answers 2
Fat grafting and Hep B
Hepatitis B and fat transfers
Despite being a Hepatitis B carrier, it is still possible to have fat transfer performed. Your physician would probably also need to make sure that you don't have significant liver disease.