I made a 40% urea cream, rubbed it on twice daily. This slowly debrided the dead skin of the calluses. That left me with 2 quarter-sized bleeding sores, which persisted. To keep blood off my shorts, etc., I covered them with medical tape. Within weeks they stopped bleeding, scabbed up, eventually came off (I don't pick scabs.). I seem completely healed. I think this means that they were caused by friction, not pressure, and resulted from the increasing fragility of my skin with age. I keep applying medical tape after showering to prevent recurrence. I bought 2-inch-wide tape because I have poor aim on my own buttocks. If you have a willing partner perhaps the usual 1-inch-wide will work.