Blanch (medical)

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.^{[citation needed]}

Blanching of the fingers is also one of the most clinically evident signs of Raynaud's phenomenon.^{[citation needed]}

Blanching is prevented in gangrene as the red blood corpuscles are extravasated and impart red color to the gangrenous part.

See also