Non-blanching rashes can be a sign of serious illness, but not always Medically reviewed by Brendan Camp, MD A non-blanching rash is a type of rash that doesn’t disappear (or blanch) when ...

It involves pressing a glass against the affected area of the skin and seeing if the rash goes away. If it doesn’t, you or ...

but do not exclude bacterial meningitis if the rash is absent or fades when a glass is pressed against it. A non-blanching rash (which does not fade) indicates septicaemia. However, a rash that does ...