You searched for: “pygalgia
pygalgia (s) (noun) (no pl)
Outdated, soreness in the buttocks, i.e., a pain in the rump: Janet read that there were various reasons for pygalgia, or the suffering in the gluteus maximus, including an injury, a nerve compression, and overuse conditions.

Pygalgia is related to proctalgia, or pain in the rectum.