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Need advice on how to help an acquaintance. He thinks no one sees him doing it. Slips off shoe, pulls down sock, picks away at feet, then slips it into his mouth. Does this all the time - constantly - in meetings with clients, in restaurants, in church, at home, everywhere. I won't mention it to him - he'll just deny it. Someone tried - brushed them off. Everyone is disgusted and doesn't know what to do. Any advice? This is grossing everyone out.