Hi Hannah!
I guess you may have exostosis, benign (non-cancerous) bone tumour. Actually, that means you have extra bone growth on a bony surface. This growths can be accompanied with pain or can be painless. Do you find it as round or oval hard bony mass?
They can be caused due to a long-term irritation as a result of osteoarthritis, infections, or trauma.
You can visit your doctor and ask for a radiological exam.
Write us back what you'll decide to do!
Best wishes!
Marija