very distressed!!

I have rheumatoid arthritis, and started infusion therapy in February. I have had two rounds so far, and now weird issues are happening. I have been battling with a rash that shows up only on my face. Tiny red bumps that form a circle, but do not itch that much. It's on my left cheek, chin area, and now getting those bumps under my nose and forehead. Can someone shed some light on what this can be?

https://preview.redd.it/517uy8cmfote1.jpg?width=3024&format=pjpg&auto=webp&s=02d459631dcfb91ceaa1f91dbb725cd73f02e574