Hi,
Welcome to the forum. I am really glad to help you out. Any abnormal swelling needs to be further evaluated. I'll suggest consulting an orthopedic surgeon and getting yourself physically examined.
You might need further tests like an X-ray or a CT scan to know the nature of the swelling. It could possibly be a benign growth like osteoma but it is extremely difficult to comment with evaluation. I sincerely hope that helps. Take care.