The conversation between human and AI assistant.
[|Human|] I have a lump about the size of a soft ball under my left breast on my rib cage. Its soft and squishy and feels kind of like a water balloon under my skin. There are no lesions, but it is sore. I had x rays and they came back negative for broken bones. I am 15 years old 179 pounds and 52.
[|AI|]  Hi and welcome to Chat Doctor. Thanks for the query. Xray can't show soft tissues well, and you should do ultrasound to check the exact diagnosis but in your age this is usually just some benign subcutaneous cyst or lipoma or atheroma, and you should not be worried. If there is pain and redness around it, you should visit doctor and do further test as soon as possible. Wish you good health. Regards
