Rash reactions to the rash

Dad: It's an allergy!

Me: But i've never been allergic to anything, ever!

Dad(happily): ooh, maybe you're allergic to air. then you'll have to wear a space-suit all the time. Hey, then maybe you'll get married cos the groom won't be able to see you!

E(gravely): Baba, of course she's not allergic to air. (pauses) There's only thing she's allergic to. (pauses)
SUNLIGHT!

Disclaimer: My dad loves me very much! I am just off to my doctor for more reactions!