Thanks for writing to us.
The bony swelling on the collar bone without any history of injury
to the area is a worrisome finding. You need to get the area examined and investigated - X-ray and MRI
to find out the exact cause.
I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/Dr-Praveen-Tayal
Dr. Praveen Tayal