>>3788648You
A: Have Hemmorhoids (tl;dr butthurt)
Or
B: you actually have a pimple so either way don't fucking touch it you retard.
Use oimtment (gold bond itch or rash) and don't be a retard. Cuts on your bum are just begging to be infected by your mild retardation.
If persistent, pretend to yourself that you own an adulthood (whatever that is) and visit you nearest doctor. Preferably a General practitioner.