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Diascopy
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/43/Diascopy_of_a_red_dot_basal_cell_carcinoma_on_the_left_mid_back_of_a_74-year-old_female.jpg/330px-Diascopy_of_a_red_dot_basal_cell_carcinoma_on_the_left_mid_back_of_a_74-year-old_female.jpg)
Diascopy of a red dot basal cell carcinoma on the left mid back of a 74-year-old female. The red dot basal cell carcinoma on the left mid back is circled; the tumor blanches when a glass microscope slide is pressed against it. From a case series by Philip R Cohen, 2017.
Diascopy is a test for blanchability performed by applying pressure with a finger or glass slide and observing color changes.
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.