Can you use plasma gel to enhance your butt?

Sounds like another marketing hype scam by those (?physicians) whom simply do not know how to perform legit buttock enhancement surgery.   If they are using your actual plasma from your blood then there’s no way this will provide any significant augmentation to your buttock. If they are using some other foreign substance that they are labeling as “plasma gel” and injecting it into your buttock, these things always end in disaster‘s. Hope this helps, if not saves you time, money and possibly even your life from deadly complications. 

I haven't heard of that but if it your own plasma (like what we would do for PRP or platelet rich plasma) it is safe in theory as long as it is properly done.  Since it is your own blood product your body will not reject the plasma.  Best Wishes!!

Yes, but the results will be very short-lasting. A nonsurgical option you can try is Sculptra. It is basically a type of filler that will help add volume or create a butt lift. It stimulates collagen production so that collagen grows to increase volume in the injected area.