What hurts when you fall in the middle of your ass?

Hello, according to your condition description, considering that trauma may cause soft tissue contusion of buttocks and sacrococcygeal region, it is suggested to go to the orthopedics department of a regular hospital, take a pelvic plain film to rule out sacrococcygeal fracture and make a clear diagnosis. If it is a simple soft tissue contusion, apply cold compress within 24 hours early to reduce bleeding and swelling pain. After that, hot water was used for hot compress, and drugs for promoting blood circulation and removing blood stasis were applied externally, which had the effects of promoting blood circulation and removing blood stasis, reducing swelling and relieving pain.