I personally think that telling someone her face isn't acceptable is rude, even when it's done out of “concern,” but others disagree.
CONFESSION TIME: I Have No Idea How To Take Care Of My Face (And I’m Intimidated By Those Of You Who Do)
It’s sad that I could write a full-length book chronicling all the injustices I’ve visited on my own face. What’s sadder still? The end is yet unwritten.