I just noticed sometime last week that there's a small bump in the back of my head where my neck meets my skull. It is hard and firm in place. It hasn't really caused any pain. Sometimes I feel a mild discomfort on the left, usually back side of my brain. It hasn't grown, moved, or caused any actual pain within the week I noticed it. Does this sound serious? I'm definitely contacting my doctor soon but I just don't want to be freaked out about it. The thought that it could bring some heavy headaches or be cancerous is so worrying.