If : If the redness seems to be associated with gravity (standing / sitting, relieved by lying down), as well as exposure to increased temperatures (like in the shower), it sounds like what you're experiencing is vascular in origin. You know, those little tubes that bring blood to and from our feet and legs. Arteries, which bring blood from the heart and to the feet, are surrounded by a layer of smooth muscle that are controlled by autonomic nerves. These nerves control to what extent the arteries are dilated or constricted. If there is a problem with the autonomic nerves, your blood vessels may be dilating more than they should with gravity or exposure to warmth. The best place to start is a vascular surgeon, who will do pulse-volume recordings on your legs to access your circulation. It takes about 20 minutes and is 100% painless (they use blood pressure cuffs and a doppler ultrasound listening device). There is also a condition called erythromelalgia, which is a condition where the skin turns red from a disturbance of the arterial system. It's pretty rare and usually pretty painful. And the vascular guy is still your first stop in getting to the bottom of this. Good luck. Hope this helped.
Answered 6/20/2018
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