Do I need to melt old filler before fat grafting?

Yes, you would need all of the filler to be out of that area before you do fat grafting.  Your surgeon can inject a product to help speed this process or you can wait for it to go away. 

It depends on where you want the fat transfer to go. If you are looking to fill in the under eye area with fat transfer and you currently have poorly placed filler in there now, then yes, it would be helpful to remove the filler (by injecting hyaluronidase) first, then wait and see what happens. If you are looking for fat transfer in other parts of your face, then you are ok to proceed. 

Thank you for your question. Try with this product hyaluronidase , this product can accelerate the degradation  of the filler.I hope my answer will help you to your questionBefore undergoing any surgical procedure, please seek a board certified plastic surgeon.

It is not necessary to remove old filler before fat grafting but you may choose to go this route after consultation with your surgeon.  First, dissolving filler can only be performed with hyaluronic acid fillers so products like Radiesse and Sculptra would not respond.  In that case you would have to wait for these substances to go away naturally or move forward with fat grafting.  If you are having problems with filler under the eyes then it would make sense to dissolve this prior to fat grafting.  Generally there is no correct answer and it really depends on how much filler you currently have, what types, which regions of the face, and how much fat grafting you plan on having done. 

You can either let is dissolve on its own, or try a hyaluronidase to dissolve the material if you want to expedite the process.