Non-blanching rash

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

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

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]

References

1. Wells, L. C.; Smith, J. C.; Weston, V. C.; Collier, J.; Rutter, N. (1 September 2001). "The child with a non-blanching rash: how likely is meningococcal disease?". Archives of Disease in Childhood. 85 (3): 218–222. doi:10.1136/adc.85.3.218. ISSN 1468-2044. PMC 1718924. PMID 11517104.
2. Mitchell RS, Kumar V, Robbins SL, Abbas AK, Fausto N (2007). Robbins basic pathology (8th ed.). Saunders/Elsevier. pp. 10–11. ISBN 1-4160-2973-7.
3. "The meningitis glass test | Meningitis Now". www.meningitisnow.org. Retrieved 26 October 2016.
4. "Management of the child with a non-blanching rash" (PDF). Retrieved 26 October 2016.

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