Maybe one of those donut shaped cushions would work?

Get a cushion for your wheelchair. I had pressure ulcer when I was in rehab facility. They let me use roho cushion. But it is expensive, so look for roho equivalent.

Not sure what would work best. If they have a home health care organization in your area, call them. Those nurses know a great deal about these things. They had tricks and tips that helped my grandmother a lot.

I have had the same problem since losing a lot of weight, I am not in a wheel chair but if I sit on Any hard surface, it hurts really bad! I completely understand your problem and hopefully someone on here gives Us the answer since I have been looking for ideas too.

Omg thank you guys!