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Methods to cure facial blushing:

There exist methods that cures and methods that makes life easier for a blusher. For example the
ETS surgery. But the best thing is to change our thinking patterns but it is also the hardest thing. 

Another method, close to thinking in better patterns, is
Cognitive Behavior Therapy well know for treating phobias, and a big issue with facial blushing is that your fear to blush triggers blushing even more, so it turns into an phobia. Then this spreads so you are not being as social as you would be without this problem.

 

Then of course drugs may help, but the side effects can  be worse than the blushing itself.

Acupuncture and exotic herbs may also work, but it is hard to find someone that knows what zones and herbs are best for a blusher, those techniques are usually not included in their standard education.

Different
food may effect the way you blush, for example eating fish at a dinner salmon (preferable) may lower the risk of blushing. Keeping your body's water level balanced, with fresh cold water and ice-cubes in it, may also help your body to stay at a cool level. Alcohol may do the opposite.

Staying fit and healthy, boosts your confidence and wellbeing. Also being an honest person in every situation makes it easier for your brain to cope with embarrassing situations, when you know you have a clean conscience.  

Other things that may help are
cooling ointments,  and cooling clothes
and a bunch of other things that you may read more about in The blushers manual.