A very distraught 20yo female comes to your office stating t…

A very distraught 20yo female comes to your office stating that she has this rash and her boyfriend thinks she may have cheated on him and given him an “STI or some disease”. She said that she has been itching “down there” for a while and thought she must have another yeast infection. She was having intercourse last night and it was painful so she asked her boyfriend to look at her external genitalia and he told her that “something is wrong down there”. When you examine her, you note that the vulvar tissue is thin and white in color and that the discoloration is in a butterfly pattern. There is no discharge or odor noted. Your presumptive diagnosis is: