You statement is incorrect deeohh. In so far that wrestlers are checked with their singlets on you are correct and this is the correct procedure for NFHS rules. HOWEVER if a referee sees a spot he thinks maybe ringworm in a spot that may have been covered by a singlet at weigh-in, that wrestler would still have to produce a release form for the spot. It follows the same principle of illegal undergarments. They can be worn by a wrestler as long as they don't protrude under the singlet. If a referee notices this after a match has started it must be corrected within that wrestler's injury time or he/she is disqualified. The same goes for potential ringworm spots. If a referee spots something that he believes would not have been checked at weigh-in after a match has started or indeed even roaming through the halls if a wrestler for some reason had said spot exposed.

The weigh-in with singlets was established for the very reasons stated above in terms of fairness for females. It was not meant to allow wrestlers to cover known spots. In this instance a referee could take said wrestler aside in private with their coach to examine the spot, if it it questionable then a note must be produced. It is the responsibility of officials to make sure wrestlers are not on the mat with potentially contagious skin problems even if someone is trying to cheat the rules. Its unethical for a wrestler to try and cover a spot, and its unethical for a coach to allow his wrestlers to do such activities as well.

The easy solution to this is to have coaches/parents check all their wrestlers the night before or two days earlier and if they see something they should have that wrestler go to the doctor and get a note. I know doctors cost money but if you are willing to put other wrestlers in danger because you don't want to spend the money, then you should probably find a different sport that doesn't involve close contact.