How can you tell when someone is blushing when they have a naturally red face?

When people blush their ears turn red. That's something that you'll be able to see when they're blushing.How can you tell when someone is blushing when they have a naturally red face?
even black people blushes. watch also the facial reactions. the face would be redder especially the cheeks and his eyes will not be able to look straight i think. :)How can you tell when someone is blushing when they have a naturally red face?
well im a dude and i naturally have red cheeks, so when i blush my ears and nose and neck get bright red to lol
they start acting strange, look away, smile a lot, etc... :P
they turn even more red, their whole face