Good morning Gentlemen,
What a subject to have to deal with,every fall I run into this problem hunting my dogs,If you get one on you (attached) don't ever dig them out. Once the head has gone below your skin,trying to dig or pull them out will only break the body off leaving the head and anything they may be infected with.
What you want to do is cover the body with something like vasoline,this keeps them from being able to breath and they will back out on their own.Once out, kill them.
Flyman (Bill)