Blister On Buttocks I Get These Itchy Blister Like Bumps On My Tailbone At The Bottom Near My Buttocks Every Month Or So...?

I get these itchy blister like bumps on my tailbone at the bottom near my buttocks every month or so...? - blister on buttocks

Every month, or sometimes 6 weeks ... I will begin near the end of my tailbone on my buttocks, which breaks into a series of bubbles / bumps that are very disturbing to bite. Itch so bad that open and fill with fluid ... and then scab over and heal ... to disappear ... Which succeeded in nearly 10 years. When I was pregnant even mentioned as a nurse and she was dismissed as ... Mushrooms? or something. Not tested. I was a few years ago the diagnosis of IBS .. do not know if they are connected. I just wanted this in. I just want to know what the world is present and if someone has something like throwing yourself?