Grega -
no skin graft here either.
I only know one person who had a skin graft and a BAHA. He's a patient of Dr. Richard Weit's and he had the BAHA implant at the same time as his AN surgery.
He told me that for some reason the skin on his BAHA site failed to heal "correctly" so it was necessary to have a skin graft. I think it may have had something to do with blood flow to that area; the scalp is very vascular. I can't recall if the graft was taken from his upper arm or his upper thigh, but I do know that the graft solved the problem.
I'd ask your doc why he feels a skin graft is necessary
It's definitely not common, but then again, he's a doctor (and I'm not) and he may have a very good reason for it.
I've never had an issue with my abutment - infection, coming loose, etc. - but I think the key to the coming loose part is to wait 90 days for the abutment to calcify into the skull before you wear your device. I know some who have worn their device earlier than 90 days and had issues. You want to make sure that sucker is "cemented" into your head
Jan