"The operation involves snipping some nerves that cause blushing. It involves 2 tiny incisions in the arm-pit through which they gain access to the nerves. The whole thing takes less than 1 hour and it requires one nights stay in the hospital. It is relatively straight-forward in the hands of people who do it regularly and the people in Karolinska are experts."
http://www.irishhealth.com/article.html?id=4396