The blanching skin test is used to determine if a rash or discoloration disappears when pressure is applied, which may be a sign of another illness. ... Others include solar purpura, ...

Learn all about the causes, symptoms, and treatments for purpura here. Learn all about the causes, symptoms, ... Unlike other rashes, purpura will not change color or blanch when pressed.

Purpura and petechiae are discolored spots of skin that result from leaking blood vessels. ... The spots are also non-blanching, meaning they do not fade or change color under pressure.

The blanching skin test is used to determine if a rash or discoloration disappears when pressure is applied, which may be a sign of another illness.