Why do my ears get bright red and hot sometimes? no itching, no pain....just comes out of left field sometimes. itll say red for 30-60 min usually.

Vasodilation: Reflex dilation of tiny skin blood vessels there cause redness,flushed and burning sensations. Causes include emotional factors, blood pressure and temperature elevation, chemicals in food,alcohol and certain hormonal secretions. If very frequent flushing reactions occur which are unexplained by these factors, certain endocrine disorders like carcinoid or pheochromocytoma tumors are suspected.