I would not worry to much, i think the older they are the less chance there is thou. My springer had the same, it can turn cancerous but i would not rush in to get it dug out and choppped off, in the old days (until quite recently) they just left them but how many dogs died off cancer ?
As it turned out mine scratched his eye a wee touch and they had to knock him out anyway so i got them to do it then when he was about 2ish, i also got them to leave the other 1 on the outside intact, weren't that happy about it but i didn't want it to affect his drive or anything. I dunno if it would but u hear so many stories, he's a bloody great dog.
I'm sure ur vet will keep u right