"But, if Acne never has anything to do with any halide stuff, what about this girl?"
-I think you are into something. Of my two teenage boys, one have some acne; he is the only one that was given fluoride tablets; for his teeth when we didnt know better..
Iodine have helped him in many ways, but not so as much as I hoped with the acne. A little less inflamed, though.
I guess you have to report back, after some time on Iodine :)