why is there a small bump on the back of my head
its been there for as long as I can remember
You probably hit ur head or their is very small chance like 0.01 percent that it is cancer or it could just had been theirs since u were a baby.
I have one too its normal
it's your twin who didn't make it.
You probably just hit your head. It should go away soon. :-)
You probably have had it since u were little. or it could be a sign of cancer. but i doubt that