It depends on who the person is they are blushing with. It's usually either because they like you, or they are embarrased by whatever you have just done.
All people blush.
People with all color do blush.
Some do, some do not
Girls tend to blush around guys they like.
i don't believe people can blush dark blue but she may like you or think your an embarrassment =]
We like to look better. Blush makes our cheeks look better:] Hahaha !
The sudden exceleration of your bloodstream And when you get embarrased People blush because the feel embarrassed. Your body releases adrenaline which makes you blush.
Girls may blush dark red with anyone who they might be embarrassed by or infatuated with, regardless of faith.
It means u have a gift
Waaay too many reasons to type out in one answer, but don't worry most of the time this is a good thing. :) People blush when they are embarrased but they also blush when they are flattered, in this case assuming you said something nice to her she blushed because she liked what you said to her, and possibly could be having feelings for you.
They love you, they're embarrassed, or they're tired
very cute..i fancy them