Before I read the last sentence I was really hoping it'd say "A rash-tache." But it didn't, and that made me sad.

Okay, I don't understand. By you saying you are allergic to Nair, it must mean that this would be the first time in trying to get rid of a "moustache." Next time think for a few seconds. First off, he accepted to go on a date with you, and whether it was you, him, or one of your friends who got the date started, he at least has some sort of interest in you even though you have a "moustache." Second, next try something unless you already tried it in the past; for example, if you had use Nair before, then that's one thing, but you never did use it, and now you did, and you embarrassed yourself further. Third, if he still likes you, even with the burn mark, then perhaps you shouldn't try using nair in the future.