Check your water parameters to start with. Some fish are more affected by drifting or high levels than other fish.
It is very likely that he has also developed ick. Cycling a tank is very stressful on fish and stress is a trigger of ick. Keep a eye on him and if you see one or two more spots develop start treatment for it.
As far as moving the snail he may or may not be ok with the betta depending on his size.
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