Yeah agree with the parent above. The rashes could just be a physical manifestation of his reaction to the crayons. There could be other sinister things happening internally... not trying to be paranoid but I'd bring my child to see a doctor if it was me.
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In general, wax is not poisonous. If a child eats a small amount of crayon, the wax will pass through the child's system without causing a problem.
i would bring to the hospital for a check.