I forgot one other thing. The bump is under the skin, hard, and non painful. It is big enough for me to pinch with my thum and finger.
if u think it might be cancer it would probably be a good idea to get it biopsied
I had a bump like what you describe and it turned out to be something like a zit. I had it for 2 years before I was brave enough to mess with it. You might want to make sure it isn't the same as my problem before asking a doctor.