It sounds as if it could be a growth. You need to consult a physician, who may recommend that the lump be removed by surgery. (It's usually a simple, minor operation), tumor
a painless bump
A cyst
Any lump (painless or not) is cause for concern. I would get it checked out, it may be nothing....but it could be something serious, you should get it checked early. It could be something as innocous as harmless skin lump or it could be something more, go to the doctor to be checked out.
Possibly Lipoma. Google it. They're quite common and harmless from what I've read. But you should still see a doctor to make sure.
Epstein-barr
This could be a sign of a pull muscle or tention.You could have over lift something in pull something out of place.
It is located at the back of the fuel tank.It is as large as half a beer can
Something for your medical practitioner to look at
it's a spine disc
It could mean a large roll of hair on the back or top of the head, or it could mean a large buttocks or it could just mean a large bread roll.
keine idea
The triceps are the large muscles on the back of upper arms.