ST BARTHOLOMEW HOSPITAL / SCIENCE PHOTO LIBRARY ST BARTHOLOMEW HOSPITAL / SCIENCE PHOTO LIBRARY
Raynaud's phenomenon in the fingers. Close-up of whitened fingertips in the left hand (right) of an patient with Raynaud's phenomenon, compared to normal fingers (left). Raynaud's phenomenon is a circulatory condition characterised by vasospasm (spasming of blood vessels), causing vasoconstriction in which small arteries constrict, cutting off the blood supply.
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