F.C.
My four year old doesn't have OCD, but he eats and wipes his hands on his clothes, food, hair, everywhere! One time in art class, he was finger painting and then put his hands right on his hair. The art teacher told me she had never seen anyone do anything like that before!
I find it normal, though. So, maybe just remind your son to use his napkin, and in the meanwhile ask his pediatrician about it.
Take Care,
F.
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