Non-blanching rash

A non-blanching rash (NBR) is a skin rash that does not fade when pressed with, and viewed through, a glass.

Non-blanching rash
Both petechiae and purpura on the lower limb due to medication induced vasculitis
Specialty	Dermatology, hematology

It is a characteristic of both purpuric and petechial rashes.^[1] Individual purpura measure 3–10 mm (0.3–1 cm, 3⁄32-3⁄8 in), whereas petechiae measure less than 3 mm.^[2]

A non-blanching rash can be a symptom of bacterial meningitis,^[3] but this is not the exclusive cause.^[1][4]