I've been having this bad pain in my back on my right side near my anus, but its not bruised. Its not close to my anus, but just a little bit?

Possible abscess. If it has only been going on for a few days and is getting worse, then it could be a perirectal abscess which need to be drained by a physician. If it's lasted more than a week it has another cause, the list of which is long. Hope this helps.