i too, have this, and while it seems to fit every mention of it be it a fistulaor sinus thing, or whatever, i'm not quite sure what it is. going to a doctor is nice and all for ppl with insurance, but i don't have any yet. anyway, a previous poster mentioned odor. i too, have noticed the odor, and i will be disgusting and graphic, cuz i am not afraid, but i noticed the odor cuz i had an itch back there, which turned out to be the hole. not eraser sized, but big enough to say what? anyway, i have noticed some blood discharge, but not a large amount. enough to make some tp have a pink dot or 2. anyway, in this same area about 10 years ago, i had a similar problem that was caused by ingrown hair. but why the hole and smell? i do clean back there. any help would be greatly appreciated.