After returning from camping overnight, I noticed a red line in my butt crack. It does not itch, there is an ever so slight burning to it, but really so slight. The line begins at the top and goes all the way to my anus. I swam in the lake, it wasn t especially hot though I did do some sun bathing, and used the bathroom (It was a free campsite. The bathroom was pretty clean, but there were small flies I d never seen before in the toilet well, on the wall etc. I tried to swish them away from the area where I was sitting). I also returned from Africa August 13th, but I stayed on a colon cleanse during the duration and am finishing up that now. I would be surprised if it was parasites for that reason. Please advise. Thank you so much.