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When skin is blanched, it takes on a whitish appearance as blood flow to the region is prevented. This occurs during (and is the basis of the physiologic test known as) diascopy.
 | This article is missing information about difficulty of observation in people with dark skin. (December 2020) |
Blanching of the fingers is also one of the most clinically evident signs of Raynaud's phenomenon.[1]
Blanching is prevented in gangrene as the red blood corpuscles are extravasated and impart red color to the gangrenous part.
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