Back of thigh

Hello everyone. I was hoping to get some opinions on what I might be experiencing. I have a lot of pain in the back of one of my thighs while sitting. Regardless of my posture. Within 10-15 minutes of sitting. It also feels like it’s burning sometimes. It’s been going on for months now.

Has anyone here experience sciatica in their legs like this? I will be seeing my doctor asap too.