Non-blanching rash

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| name = Non-blanching rash

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| caption = Both petechiae and purpura on the lower limb due to medication induced vasculitis

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| field = Dermatology, hematology

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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.{{cite journal|last1=Wells|first1=L. C.|last2=Smith|first2=J. C.|last3=Weston|first3=V. C.|last4=Collier|first4=J.|last5=Rutter|first5=N.|title=The child with a non-blanching rash: how likely is meningococcal disease?|journal=Archives of Disease in Childhood|date=1 September 2001|volume=85|issue=3|pages=218–222|doi=10.1136/adc.85.3.218|url= |language=en|issn=1468-2044|pmc=1718924|pmid=11517104}} Individual purpura measure 3–10 mm (0.3–1 cm, {{frac|3|32}}-{{frac|3|8}} in), whereas petechiae measure less than 3 mm.{{cite book |vauthors=Mitchell RS, Kumar V, Robbins SL, Abbas AK, Fausto N |title=Robbins basic pathology (8th ed.) |publisher=Saunders/Elsevier |year=2007 |pages= 10–11 |isbn=1-4160-2973-7 }}

A non-blanching rash can be a symptom of bacterial meningitis,{{cite web|title=The meningitis glass test {{!}} Meningitis Now|url=https://www.meningitisnow.org/meningitis-explained/signs-and-symptoms/glass-test/|website=www.meningitisnow.org|access-date=26 October 2016}} but this is not the exclusive cause.{{cite web|title=Management of the child with a non-blanching rash|url=http://www.clinicalguidelines.scot.nhs.uk/Emergency%20Medicine/YOR-AE-023%20Non-blanching%20rash.pdf|access-date=26 October 2016}}