Every so often, one of my ears (either one, but never both at the same time) turns bright red and feels very warm. no other symptoms. should i worry?

Don't worry: It is probably nothing but a vascular tendency like blushing. But an exam might discover if it is a sign of polychondritis which is rare and very unlikely w/out other symptoms. If you find yourself worried that it's more than simple blushing - have a doctor check for a cause. Here's info on the rare condition. http://www.drugs.com/health-guide/polychondritis.html If it fits, have an exam. Best!

Little unusual: Please check our uric acid level. Gout can affect ears. Also need to r/o a condition called relapsing polychondritis for which need to do some blood test. Consult your PCPplease