Welcome to Connect, @sportedgee. Great to have you here in the MGUS discussion. Seeing that you’ve also had a prostatectomy, there is also an active prostate cancer group you may want to check in with. You may be able to provide some valuable insights to members who may be facing the same surgery. Here’s a link to that group: https://connect.mayoclinic.org/group/prostate-cancer/

Back to MGUS. Some people do experience a rash, sometimes numbness or tingling in the body, while others have no symptoms they can equate with the condition.
Tossing in another article for you: https://www.healthline.com/health/how-serious-is-mgus

Having the bone marrow biopsy will give your doctor a good overall analysis and picture of the health of your bone marrow and its ability to produce healthy blood cells. It can take a good week to 10 days for all of the analytics to be returned. Hopefully this gets you some answers as to the symptoms you’re having. I know it’s troubling when you’re not feeling right and have no answers. But it sounds like you have a good doctor who is following up on things for you.

I’m interested in hearing what your biopsy results show. If you don’t mind, would you please report back?