Sometimes my butt cheeks will get incredibly itchy at night. It will have a bunch of bumps and be kind of dry. And though I've never seen it, I believe there would be some redness. This keeps me up all night. What could cause this? Sometimes I won't shower for a day, could that be the cause? I usually just use rubbing alcohol to ease the itching, but it's painful, it only eases it for like 2-3 seconds, and it will probably cause some problem down the line. What do I do?