Without getting too TMI...I noticed it today after I pooped that it itched a little after I wiped and I touched it and it felt like there was a small lump/bump on my anus. I shortly forgot about it thereafter until later...I was changing my panty liner (I wear them daily just for cleanliness) and the edge of it touched it and it itched again. It doesn't hurt, just when I itch it.
I doubt it is anything serious....I don't think it is an STD or anything like that because I've only had sex with one guy a handful of times and he always wore condoms and it never was anal or anything of that sort. I think it may be a pimple because it is kind of the same as when I had a pimple on my vagina where it doesn't hurt but it itched if something touched it. (And I am certain that was a pimple because my mom said so)
I'm 19, if that helps any.
The other thing maybe it is from my underwear? A few of my undies (my favorite few) are all bunched up in the butt i don't know why they're just like that so maybe that's irritated my anus or something?
It didn't hurt when I pooped and I didn't notice it until after.
EDIT: It has to be a pimple...I looked and I can see the tiny red bump with the white head - just like when I had one on my vagina.