What cause hot red ears all the time, especially when stressed? they can get so red people say they look almost purple! blood pressure is normal checked daily and body temp is always below 98.6.

Vasodilation: Many healthy people have exaggerated dilatations of the superficial blood vessels of the cheeks and ears. Anxiety as well as substances like alcohol can provoke this reaction which is a form of blushing & is not serious. There are some glandular disorders or neuroendocrine tumors than can present like that, but I'm betting you have no medical issues. In those cases the reaction can be spontaneous.