<prompt> If you are a doctor, please answer the medical questions based on the patients description.12 year old daughter developed a lump under the skin above the left collarbone..did an xray found a cartilage mass is ordering a CT scan also...any clue on what is could be...it doesn hurt her...she has had swollen lymp nodes at a younger age but they didn t hurt either.  <response>: Hello, It is good to know that you had CT done. Wait for the CT report. Your daughter has a history of swollen lymph nodes since a younger age. Such lumps are commonly caused due to infection, enlargement of the lymph node, get her examined. The doctor may want to take a sample of the fluid for the teststudy to rule out cancer. Not all cysts tumors are cancerous. It looks more like a lipoma, lipomas are harmless, if it is not growing theres no problem. If it gets painful affects daily life then it needs to be removed. Get your daughter evaluated treated at the earliest. Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor. 