Dont worry!!!
It is most likely nothing at all... but get it checked.
to put you at ease, i have two lumps on my head, and the are fine, nothing at all to worry about, most lumps are nothing.
I could be a gland, or a blocked fat gland.
Go to the dr... AND STOP POKING!! you will make it worse lol
.x.
jen where did they position your port ? as mines in my chest between my boobs. mine feels the size of a 2p piece.