I doubted the pics wld be of much help, For now there are no deep wounds, he's getting around fine, eating and thriving,so mb the wait and see approach is best,& no more soaks. They also forage,even in the cold,so as you said, could be frostbite. I think at one point I thought that was it, but expected it to just dry up and fall of rather than create a wound. If one does open up or worsen, I'll be back in here -

begging for help.
@R2elk - with all sincerity, I really do encourage you to write a book or article solely abt guinea fowl. Much out there says it includes them in poultry books, but then kind of forgets they exist, leaving the reader trying to determine if that means they should just assume they are/are not included in certain topics. I just finished the Storey Guide to Poultry that did exactly that, opting to read it bc a thread from years ago, one commentor chastised the OP, saying they should read the Storey Guide for Guinea fowl. - as far as I have searched, that doesn't exist-& though informative abo0ut poultry, the one I did read was outdated in many respects.
Example of things not addressed - within this thread, in the beginning, I kept mentioning loose stools,and despite everything you suggested, I was still having these blobs of unformed excrement. Everything says guineas have dry,formed stools w/the urea white cap, and those were indeed present.
It wasn't until I pondered the days when my kids had rabbits that expelled cecal matter that it clicked & I went searching. Have found much written abt chicken cecal matter-but not abt guineas,or including them. So a novice like me who hasn't had poultry,reading article after article abt how dry guinea fowl poo is, doesn't get the full picture and then panics bc everyone says-and yet here's this sticky blob.
I realize that makes me sound like an idiot who probably shouldn't have started off w/guineas. When I think of the ones I lost in those first days- I'd have to agree. As I looked at that site w/pictures of the varieties. & felt the tug for keets, I realized I'm not ready to add to my little group. But there are going to be more well-intentioned but clueless ppl who for whatever reason and up getting a box of keets through the mail. - and I thank you from the bottom of my heart for helping me keep mine alive.