<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello! Today is Thursday, on Tuesday night my boyfriend was stretching in the car n felt something odd... when we got home he noticed a lump in the center of his chest , closer to being locKed under his right breast... could this possibly be a rib fracture?  <response>: Hi, dairy have gone through your question. I can understand your concern. He may have fracture or hematoma or other mass. He should go for x-ray chest. It will give you exact idea whether it is fracture or not. Then he should take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. 