I've never delt with iguana's before, but it really just looks like bad shed to me, there's no sores, so I'd doubt a fungus.. I'd soak him in a bath for a lil while and see if you can't help coax it off...There's stuff called shed ease by zilla, that's suppose to help with shedding also.
Just keep with the baths, and healthy feeding, and it should still shed out as he grows, If it's just from bad sheds, in my opinion...
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