7 weeks Earlier I fell on stairs and hurt my coccyx. 4 weeks earlier near bum crack some redness developed for which I took some medication like deflazacort and LCZ skin allergy further developed through entire body for which I further took some medication like Augmentin, LCZ and Omnacortil (40 mg for 5 days then 30 mg for 5 days and so on. Rashes and allergy were gone. Since I was hurt and there was allergy I used to sleep with belly underneath. But when everything was ok I slept with back underneath and then again rashes developed at the lower back and bum. Sir I am still under medication with asteroid. Various tests were conducted like Stool ,Urine ,CRP ,Lipids, CBC ,TLC, Hep B, Hep C, ALSO,Throat Swab Test & ANA and every results came negative, Can this new rash be pressure sore or what type of allergy it can be?