### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
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!

### output:

Hi, Dear,Welcome with your query to Chat Doctor. Studied your query in full depth of its details. Reviewed it in context of your health concerns. Based On the facts, You mostly seem to suffer from-Boil in the butt crack, which recovered on its own, being in the initial stage of the Abscess in the boil. Friction in the area caused recurrence. Being in the pressure area -is causing a lot of pain when you seat on it. If recurs repeatedly-X-ray fixed any other cause like? Colonial cyst with abscess /? Teratoid Desmond cyst with necrotic tissue-which is common in this area. Other causes of such a complaint needs to be ruled out and treated if present accordingly from Second opinion from Surgeon and Ortho-Surgeon if needed. Hope that, This reply would help you to plan further treatment soon with your treating doctors. Best of Luck and early recovery. Welcome any further query in this regard, which would be replied in next session. Good Day!! Chat Doctor. N. Senior Surgical Specialist