The only shot in the glute I've ever had was demoral, a pain killer, so I am no source for steroids. However I had this happen to me, suprisingly sore the next day and a half, as well as bruising around the injection site. I dont recall any "hard spot" though, I believe thats one description of an abscess. Are you sure your shit was legit? Was your needle unused and clean, as well as the injection area? Were your hands steady during injection, or could you maybe have damaged muscle tissue with shakiness? Good luck.