Other comments here seem to be more detailed and could help more, but I have a simple check to do. Is your chair at the right height? If the chair is too low,

Other comments here seem to be more detailed and could help more, but I have a simple check to do. Is your chair at the right height? If the chair is too low, your knees stay higher than your ass, and you ass sustain all of your upper body weight. If the chair is too high, your knees stay lower than your ass, and your thighs sustain most of the weight. I suspect that what is happening to you as you say "I get this pain specifically where it makes contact with the chair". Ideally, your knees form a 90º angle and you can feel the weight more uniformly distributed between your ass and your thighs. If I were you I would reposition the chair's height so it is a little bit too low, purposefully relieving your thighs from the weight. Check if it helps with the pain. If it does, you can gradually adjust to the perfect 90º (or you will soon have the same pain in your ass).