You can't. It is a biological reaction. And many girl's find it endearing, so why would you want to stop it?
How to not Blush around your Crush?
Lots of foundation . . . Just pack it on like you're going in front of camera for television.
Stay away from your crush............problem solved.
Embrace it!!
Blushing is good, it shows a glimmer
of honesty.
If you even have the slightest thought that she likes you (even as a friend), don't bother. It's absolutely adorable.
Not necessarily a sex question...but you really can't stop from blushing. Good thing I'm brown.
Initially it happens and you'll get used to it.