Conversation: The conversation between human and AI assistant.
[|Human|] I have a small, hard unmovable lump behind the top of my left ear. It feels like it is attached to the bone of my skull and my skin moves freely over it. Also, the ear that the lump is behind has sun damaged skin that I am having removed. I am told that the damaged skin will turn into skin cancer if its not removed. What could the lump be and are the two related?
[|AI|]  Hi, Thanks for writing to Chat Doctor. That lump can be a Desmond cyst, with a possible intracranial extension. You need to show it to a surgeon for a physical examination and a skull X-ray. That lump and the skin can be removed in a single sitting only simultaneously, and they are mostly unrelated to each other, unless the lump runs out to be a lymph node. So it is advisable to get a needle biopsy of the lump prior to its excision, as it will help in planning the excision. Regards