How do I polietly ask someone to stop a bad habit?

I share an office with a lady who always picks at her face, causing scabs.. it is really a hideous habit! How do I tell her she would be beauiful if she just stopped marring her skin?
I don't want to over step my boundries, we are not super close or anything. But she is a lovely girl, despite her nervous habit.

You can't "ask" someone to stop something that is a nervous habit. Its like asking someone to stop smoking, chewing their finger nails, or twirling their hair. Most poeple don't even realize they are doing it.

If you really feel the need to say something, the next time you see her doing it I would say something like, "Hey Linda, whatcha doing to yourself over there? That is a vewwy bad habit!!" and see if she says anything about it. Be sure to be light about it, not all serious like it is a huge thing.

HOWEVER, she most likely knows about the problem. She also could have a medical condition or just really bad skin. There is NOTHING that can be done about some things and to bring up a problem that she knows about, can't do anything about, and is most likely very embarrassing to her isn't really that great of an idea. (I myself suffer from something similar and am always horrified when someone mentions it to me. Hello... I freakin' know there is something there!!!)

Let her be, it is not your face and think how she will receive that bit of info. It will be akward between you.

Have her declared a terrorist supporter and they will take her away, then you won't have to see her.

Tell her that she's ugly.

Tell her to stop picking her face it's going to leave scars!

give her notexma and say nothing else

Spend time with her and maybe strike up a friendship. Compliment her on a regular basis and build up her confidence. Only after you're friends, the opportunity might come up for her to share with you why she does that to her face. Tell her about the latest makeup that you recently tried and offer to give her a makeover sometime. I think just being nice can be a lot more effective than confronting someone about a gross habit.

There's really no polite way to tell someone that her personal habit is destroying her complexion. Polite people don't even notice others' habits, or their skin, unless it is to complement them. Unless you're a close friend (which you say you aren't), you'll just have to suffer your co-worker's habit in well-bred silence. The only real option you have is to try and find something opposite to her habit to complement.

Let it go!!