Zapper itch

I've been putting the connection for my zapper around my arch hoping that it will shock my worm piles in my ankles but now I have strips of itch that feels grainy under the skin, it's a horrible itch last night I got up and took a paint brush with iodine on it and covered the area that when done went from itch to hurt. Any one have this happen? any idea's I feel that I must zap but I can't take the itch.
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