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Textbook/Dermatology/Non-blanching rash and purpura assessment/Rapid
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Non-blanching rash and purpura assessment

Essential points for quick revision.

2 min synopsisUK scopeSources checked 27 Aug 2026Clinical review pending
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Purpura with systemic illness

A rapidly evolving non-blanching eruption with fever, altered behaviour, neck stiffness, limb pain, cold extremities, prolonged capillary refill, hypotension, breathing difficulty or reduced urine can signal meningococcal disease, sepsis or disseminated coagulation before shock is established.

Action: Use an immediate ABCDE assessment, call emergency transport or the resuscitation team, obtain cultures and bloods only if they do not delay care, and start age-appropriate parenteral antimicrobial and sepsis treatment through the current local pathway; isolate and notify suspected meningococcal disease as required.

Synopsis

Triage a non-blanching eruption without delay, describe purpura accurately across skin tones, distinguish infection, bleeding, inflammation and occlusion, and direct immediate tests and treatment by physiological risk.

  • Non-blanching means colour remains when firm pressure displaces blood from nearby capillaries; it describes extravasated blood or fixed vascular material, not a diagnosis.
  • Inspect the whole skin in good light, including conjunctivae, mouth, palms, soles and pressure areas; in brown or black skin, petechiae may be clearer on paler mucosa or by side lighting and palpation.
  • Never use a reassuring glass test to overrule an unwell patient: early meningococcal disease may have a blanching, sparse or absent rash, and deterioration can be fast.

Key red flags

Toxic appearance, rapid lesion spread, fever or hypothermia, altered consciousness, severe limb or abdominal pain, meningism, respiratory compromise, hypotension, delayed refill, oliguria, mucosal bleeding, neurological deficit, pregnancy or immunosuppression requires same-day hospital assessment.

Retiform purpura

Angular branching non-blanching patches map an obstructed vessel network; pain, coolness, ulceration or black necrosis signals threatened tissue.

Investigation priorities

01
Immediate observations and perfusionFirst step

Detect sepsis, shock and limb-threatening vascular compromise before diagnostic sampling.

Management branches

Emergency first sequenceTreat physiology before naming purpura

Non-blanching lesions accompany fever, toxicity, rapid progression or impaired perfusion.

  1. Start ABCDE assessment, record the evolution and summon senior emergency help while checking meningism, limb pain, shock, bleeding and a likely infectious source.
  2. Obtain cultures, lactate, FBC, coagulation, renal and liver tests if this causes no treatment delay and begin parenteral antibiotics and sepsis resuscitation through the current age-specific protocol.
First-line stable assessmentSeparate leakage, inflammation and occlusion

The person is physiologically stable and the eruption is not rapidly advancing.

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Sources and review status3 sources · checked 27 Aug 2026 · clinical review pending
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom