Conversation: The conversation between human and AI assistant.
[|Human|] My 6 year old has a lump about the size of a dime on the back of his neck, centre right.  It has been there since he was 1 year old.  I went to the doctor a few years ago who said it was probably a fly bit, but three years later it is still there.  It is hard and seems to move a little when i try to move it around.  Also, he says it doesnt hurt.  Any ideas what it could be?
[|AI|]  Thanks for your question on Chat Doctor. I can understand your concern. By your history and description, possibility of Desmond cyst is high in your sons case. Desmond cysts are benign soft tissue swelling common in back of neck, back, extremities etc. It is composed of calcium. This is the reason for hard feeling. Get done ultrasound examination of local part and fine needle aspiration cytology (FNAC) for the diagnosis of Desmond cyst. Usually no treatment is required, but if it increases in size or becomes painful or becomes infected than surgical removal is advised. Hope I have solved your query. Wishing good health to your son. Thanks.