<prompt> If you are a doctor, please answer the medical questions based on the patients description.ok so I have this lump or bump on the inside of my elbow it started out looking just like a pimple so I popped it, and it was fine for a while but now it has scabbed over a little bit and its about a nickel sized hard lump under my skin that s tender to touch but rock solid I think it might be starting on my other elbow too, what could this be? How can I solve it?  <response>: Hi, thanks for writing to Chat Doctor. Well, as per your description, if I were your treating physician, I would have come up with only two possibilities like:1. A sebaceous cyst that has been traumatizes and infected! 2. some cyst-like condition like bursa, ganglion or inflammatory irritation effusion in the joint! I also suggest you to go for a microbiologicalcytological test of the lump for confirmation and to relieve your concerns! Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health. 