You know why Rule 3-1-2 applies to this? Here is the example:
The wrestler goes through skin check at weigh-in of the tournament, and Referee A passes him at 8:15 am. When the wrestler walks onto the mat for his first match at 11:15 am, Referee B is on that mat and sees something on the skin of the kid, and declares the kid is not eligible to wrestle.
So, you see, that example actually does happen every season at some tournaments. I've never done that, but, I've talked to colleagues who have. And, that is the authority granted by Rule 3-1-2 to the official.
But, I do want to emphasize to everyone reading that I am recommending that the official NEVER overrule the DMP who says "NO". If the DMP declares the wrestler as contagious, DO NOT EVER try to overrule that decision. I would never want any referee to be in the position of trying to defend their actions if someone with MRSA, impetigo, staph, etc. was flagged by the DMP, but the referee allowed the kid to wrestle.