Diascopy
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Diascopy is a test for blanchability performed by applying pressure with a finger or glass slide and observing color changes.[2][3][4][5]
It is used to determine whether a lesion is vascular (inflammatory or congenital), nonvascular (nevus), or hemorrhagic (petechia or purpura). Hemorrhagic lesions and nonvascular lesions do not blanch ("negative diascopy"); inflammatory lesions do ("positive diascopy"). Diascopy is sometimes used to identify sarcoid skin lesions, which, when tested, turn an apple jelly color.
Diascopy with glassware is used as a method of diagnosing bacterial meningitis, as the rashes caused by the illness are non-blanching.[6]
References
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