Try him on some Benadryl to see if this could be related to an allergic reaction as it may not itch but since it did come on suddenly it could still be related to an allergic reaction to something that has come into contact with his system. It may also be related to a possible circulation issue so this is something to consider as well but it does sound more like an allergic reaction and the Benadryl will help to calm down the rash.
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