I know, I'm constantly giving advice and telling people that they should go to the hospital, but I'm really curious as to what this could be. Today, my younger brother came up to me and showed me this odd scabbed blister on his pelvis/hip bone. It kind of looks like a meteor hit the moon (that crater effect). It's red, not itchy, and the scab just falls off he said. He's got two more on the base of his shaft and he's not sure where he got them from. I'm not sure if it's an STD because it doesn't sound like one I've heard of before, plus he's always wearing condoms and is in a monogamous relationship. Has anyone seen a crater-like injury before? It isn't blistering, no pus, it looks like the aftermath of picking a scab after chicken pox. Thoughts?