Here is My Question:
My bad leg which is the right one turns purple and black is now very very cold to the touch..it feels like it has been in a meat locker.
Chronic red-purple, cold legs after injury to the spinal cord from a disorder like MS, especially when it primarily involves the feet (or the distal limb) and always the weaker limb, is usually caused by a condition called secondary acrocyanosis. The discoloration and decreased temperature to touch is a result of impaired regulation of vascular muscle tone in the capillary blood vessels. Essentially, the capillary arterioles constrict and the venules dilate causing both the cold temperature to touch and the persistence of deoxygenated blood (blue to purple) in the capillary vessels. This is a harmless process often associated with swelling and increased sweating in the discolored limb.
This is to be differentiated from a limb, or part of a limb, that suddenly becomes white followed by blue or purple or even black with pain and coldness to touch from an sudden loss of blood flow. This is an acute emergency.
Revere P (Rip) Kinkel, MDProfessor of Clinical Neurosciences
Director of the Multiple Sclerosis Program
Clinical Neurosciences Director
University of California San Diego
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