Help, TMI. Hemorrhoids?

Vandielou
How do I know if I have hemorrhoids? I have noticed bleeding twice now over about a month and a half. I have these bumps on my buttchecks. Near the inside but always on the cheeks. I thought maybe it's my underwear rubbing the wrong way but I have no idea. They feel almost like pimples. Please tell me someone else out there has had something similar.