The past week i ve been dealing with a hard lump underneath the skin located in my lower back. It s embarrassing to say, but it s actually located about an inch down inside of my butt-crack, almost but not quite, in the center of the crack.It s about the size of my thumbnail and it hurts when I sit down or lay on my back. I had my mother look at it so see if it was a pimple or a boil, and she said she couldn t see anything that looked wrong. She couldn t even visually notice a bump of any sort. However, when I rub my finger down on the area I can feel the bump and know there s something there that isn t suppose to be. It isn t squishy and feels hard-like. It isn t noticeable from the top of the skin like I mentioned. it was really painful to sit on nd move about a week ago nd died down but then started up again! Some days is sorer than others if hit it wrong way, however it isn t unbearable pain so I don t think it s a cyst like other messages I have read!