Ischial Tuberosity Pain

I had something similar years ago, turned out to be ischial bursitis. Super tight hamstring and adductor muscles can cause the bursa on your sit bone to flare up. In my case I found out I actually had a short leg on that side and was sitting crooked on the bike. Seeing a doctor for a scan to confirm what’s causing the pain and a bike fit with someone skilled in dealing with pelvic asymmetry (if that’sthe cause) would be a good start. Good luck!