I am not sure how a birthmark can be mistaken for a contagious skin condition but if you are concerned about it happening again then you can have your doctor fill out a skin release form and carry it with you to any future tournaments you attend. It is too bad that a 6 year was denied the chance to wrestle over a birthmark but infectious skin conditions could spread like wildfire in a contact sport like wrestling so I hope you understand the concern whoever was doing skin check at Salina had.