It could be the mastoid processes.
These also can be little cysts (not cancerous) or fatty nodules. If you are worried then please see your doctor.
Swollen lymph nodes.
Swollen lymph node, often from infection. Nothing to worry about. Give it a wk or two. . The Internet is no place to diagnose medical problems you are having. If you are worried you should go and...
Could be lymphoma,go and see a lymphoma symptoms website.Good luck
It could mean anything. You should have a doctor check it out as soon as possible. If it is a cancerous growth, then you will want it caught early.
Just wait for it to go away.