I had a fat transfer about 3 yrs ago. I now have a yellow circle under my left eye which I try to hide with make up (Photo)

This looks more like xanthelasma but could be fat if injected as microdroplets.  I suggest you see an expert to evaluate the treatment options.  Best, Dr. Emer.

Hello, and thank you for posting a photo along with your question. I agree with my colleagues below and it seems as though this fat is superficial and this will not resolve on its own, especially this far out. I also agree that you should re-visit with your plastic surgeon and discuss your concerns with him and see what his recommendations are. Ankur Mehta MD

This appears to be fat that was place too superficially and is in the superficial dermis. Contact the surgeon who did the procedure about revising the area.

This is likely fat that was placed superficial. Sometimes it can be removed.  Best of luck...........

It is very unlikely that the "yellow circle" will resolve 3 years after your surgery. It probably is fat in the superficial layer of your skin which can be removed. Consult with your surgeon.