How is anybody supposed to answer your question in this thread? it is for people who want to work for them, not for people who already do and know all of their recruitment policies inside out!
Probably the best place to ask is in the emirates crew discussions thread, as the people in there currently work for Emirates, and may be able to tell you if they have any Friends/Colleagues or even themselves who are already working for Emirates who have a birthmark similar to yours?!
I think the first question on anybody's lips is "will it be visible when you are wearing a uniform?"