Good news, since deer dont have spots (well legal ones) you should be alright at just picking out a spot on a deer.
This is one reason I'm not overly concerned about it. I hope it doesn't progress, but it hasn't in 2 years. I still want to remedy the situation though. So far it seems time and patience and diligence are the only solution. I've got the patience and diligence....time I'm short on(aren't we all?).

I think I'm going to do as much research as I can and then work on my problem next spring.