Due to sitting rexine chair my anal opening was wet in summer season.there was some itchy conditions first then there was some part was noticed red some days like mouth ulcer .& then 30 % anal opening was pain whenever i was tried to sit on chair or anywhere when that anal part touch to surface of chair or pillows. Previously 3 yrs back my piles operation was operated, & that was successful for some days then there was bleeding due to piles then i had done sclerotheropy & that stop. I had shown lot of piles, fissure doctor and also done MRI fistulogram but that's is also clear. No any reason detected in MRI.no any surgery need I think there is problem in sentinental region burning sensation bcoz of sitting and friction. There is some part like 3 mm 2 circle region in posterior side extends and cauz pain like burning when stressing skin. And also senseation when hard stool come. But there is no any visual sign of fissure. So let me consult what to do? What is the problems?