<s>[INST] right in the middle of the top of my ribcage is a bump. no pain with it, and it has been there for about 10 years. do you know what it is? Im a 29 year old male. 66 185lbs.  No health problems other than allergies and being diagnosed with Asthma in the last year which is tied into the allergies. [/INST] Hi! Thanks for writing to Chat Doctor sharing your health problem! After going through your description, I could remember many of our patients who visited our clinic for the same reason; they too had long term painless lump on the rib cage. As per my experience of ultrasonographic imaging and needle biopsies, I could suggest following possibilities in your case:1. Benign skin lesions like adnexal mole, fibroepithelial polyp, papilloma, sebaceous cyst2. Benign stromal lesions like Schwann, neurofibroma, lipoma dermatofibroma etc3. Benign bony or cartilaginous tumors like Chen Chat Doctor.  </s>