BenefitBenetint Lip & Cheek Stain Travel Size 0.13oz/4ml

Can you use it to color nipples that have lost color?

I have a problem that lipsticks do not color my ineere lips. Does the color paint also the inner lip or only the outside lip?

Are there any number/letters on the bottom of the bottom? The color is worn off my bottle and I'm not sure if this is it.

Es original?