Hello and thanks for posting,

It isn't very likely to be anything serious. Try not to Google, except sensible websites such as the NHS website. Searching on the Internet, does not replace a doctor's opinion, and only increases anxiety usually. 

Unfortunately, this forum is not really meant for people with symptoms, as we would always suggest you ask a doctor about any health concerns anyway. 

There are alot of possible explanations, and it is probably part of your usual anatomy. Bones have lumps and bumps, due to past injury, and tendons and muscles also run across bone surfaces. Hopefully, your GP can reassure you. They may not need to see you, after assessing you.

I hope that this helps, 

Best wishes,

Vanda