When you go and get the form filled out, just have the Dr. write and short letter detailing the birthmark. Get the form and the letter photocopied back-to-back and have mutliple copies made. That way you're not "out of luck" if a ref/meet managment doesn't get the form back to you.
I work HS/College and Lyons HS had a kid with a non-contagious skin form with 4-5 pages of documentation of the rash. They said they had called KSHSAA and they agreed there was no need to keep going back each week. My suggestion was for the coach/AD to email KSHSAA and get a "written" reply to that essence, so they could print it off and have themselves covered 6 ways to Sunday.
My suggestion, is for you to get the forms, maybe contact the Ks. USA "director" and write a similar letter, verifying that the documentation is legit so you are covered that same way.
Hope this helps...