I am a 50 year old woman, 5'8", 125 pounds, in excellent health. I am a distance runner and for the last couple of months have been having irritation and tenderness around my anus and between my buttocks when I run. No problems when hiking, only when running. I first thought it was just sweat since it's warmer now, but I've seen bits of fecal matter on the TP when I've used the bathroom immediately after a run even though I've not had a bowel movement. Could this be exercised induced fecal incontinence causing the irritation?