flops

My favorite thing about Spring and Summer is wearing flip flops. I absolutely love them and wear them everyday. It makes me feel casual, calm, cool. LOVE THE FLOP! But I am having issues.

Everyday I get home and the bottom of my feet are BLACK. It's bad. They never used to do that! I have to scrub my feet every night to get it off. I think it's from living in NYC and walking a ton everyday. No matter which flip flops or sandals I wear, they get black. Help!

What's wrong with me?!!!!! Any suggestions??! Please don't say "Don't wear flip flops."

Emily