<s>[INST] Hi, I have two very hard, very tender lumps on either side of my tailbone..right at the top of my buttcrack. It feels like they are under the skin and they are extremely painful....any idea what it is and what i can do for it?? i have been using bacitracin and warm compresses for the past two days...thanks. [/INST] Welcome to Chat Doctor Hi I'm Chat Doctor. I will help you with your problemWhat I gather from your question-two very hard lump on either side of my tailbone- it is right on top of the butt crack- it is very painful, and you think it is under a skinned on the symptoms and area involved it is appearing to be COLONIAL SINUS?? But this needs further elaborate HISTORY i.e. When did you notice it? How you noticed it? Its progression? Is there any discharge? Is it associated with fever? What are the relieving and aggravating factors? Do you have a desk job or you Chat Doctor? I hope this will help in solving your problem. Wishing you rapid recovery. Please do rate my answer if you like regards </s>