
Hi Vinnie
I don't know about the 'resident expert' tag........!!:rolleyes:!!
I think that the histiocytomas are reasonably common in young dogs - maybe the ear is a more unusual place. I think that you may find that it itches a bit, and maybe the pup will scratch at it, and get it infected, which is what happened with one that we had once. Play it by ear - you may need an Elizabethan collar or some such if that happens, and antibiotic. This could also happen if you have it removed and it grows back again.
The ones that we've had have appeared very quickly - round flattish things like a squashed cherry or strawberry. I've always thought they were caused by a virus, rather like a cold sore or a verruca.
Personally, I would leave one on my own dogs for the body's own immune system to deal with, but if your vet feels strongly that it should be removed, go with it.
Jo