I have heard of snakes getting bad feeders and then shedding out parts of their coloration. I have also heard of snakes developing fungal or bacterial growth under the skin and it caused the snake to lose color. i would have your vet take an actual sample and TEST for some kind of microbe or something. Just looking him over would not be enough, you would need tests. As for the snake possibly being calico, it doesn't look like a random and clear enough distribution of white. Calico retics do develop their white over time, but you would think it would be in more random places than just those few. Especially with how round the patch is on the head, it looks like exactly what a skin ailment would do, it would start at one point and radiate outwards in a circle. You can see how at the edges, some of the scales are half white, half brown, and witch calico scales, the whole scale is usually white, but half and half. That is the main thing that makes it look not-at-all calico. I have seen a whole lot of calico snakes and something just doesn't look right about the patches on yours, especially that round one. It looks really suspicious. I would definitely not go calling it a calico just yet. It literally looks like the white just started radiating outward from the center and like it may possibly continue to do so. It looks scary! I would have tests run to try and find the cause of the problem, you can't possibly know if he's actually sick or something without testing for it. good luck!
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