And what is a polite way to tell a friend her makeup looks bad? I have a friend whose foundation is several shades more orange than her skin but she 'doesn't notice'.
Most Helpful Girl
I don't wear makeup either (except when on stage for a play, and I hate it then) and there are a lot of other girls who don't. If you don't like it there is absolutely no reason to wear it, regardless of what your friends think. Just tell them that there are tons of girls who don't wear it and tons of guys who like girls better without it. Plus, they really shouldn't care if they're really your friends, and even if they do it's not important because you're your own person and can do what you want :)
And maybe if you ever go shopping with her and are in the makeup section, you may find a lighter shade of foundation that matches her skin tone better and just casually say something like "Ooh, you should really get this! It would look great on you! It's close enough to your natural skintone that it won't be overpowering but still extremely pretty." Or if that doesn't work just kind of casually mention that she may need a lighter tone. If she listens, good. If not, at least you tried. :)