Hi. I currentley am experiencing a pain in my anus. There seems to be covring my anal cavity a large lump shaped like a mushroom. It kind of feels kind of raw or swollen. The lump seems fairly solid. This is the second or third time this has happened to me and I can't sit, walk, or poop without pain. I am only 18 and have never been sexual active. Please help me out here, it is getting ridiculous.