Synopsis
Treat a non-blanching rash as a time-critical sign when the child is unwell, while using distribution, palpability, platelet and coagulation patterns and renal or systemic findings to distinguish meningococcal disease, ITP, IgA vasculitis, malignancy and mechanical petechiae.
- Petechiae are pinpoint non-blanching lesions; purpura are larger. Press with a clear glass only as an aid—good lighting, skin tone and the child's physiology matter more than a single bedside trick.
- Any child with a non-blanching rash and toxic appearance, altered consciousness, shock, severe limb pain, rapidly spreading purpura or meningism needs immediate sepsis and meningococcal management.
- Use ABCDE, obtain vascular access and blood cultures when this does not delay care, give guideline-directed parenteral ceftriaxone or cefotaxime and arrange urgent paediatric transfer; do not wait for lumbar puncture.
- Meningococcal disease may begin with fever, leg pain, cold hands or feet and pallor before obvious purpura, and absence of neck stiffness does not reassure a young child.
- A well child with isolated thrombocytopenia, petechiae and bruising but no hepatosplenomegaly, bone pain or lymphadenopathy may have immune thrombocytopenia; bleeding phenotype matters more than platelet count alone.
- Palpable purpura over legs and buttocks with abdominal pain, arthralgia or renal findings suggests IgA vasculitis; measure blood pressure and urinalysis even when the child looks well.
- Petechiae confined above the nipple line after forceful coughing or vomiting can be mechanical, but only after a full history and examination excludes systemic illness and safeguarding concern.
- Pallor, fever, weight loss, night sweats, bone pain, hepatosplenomegaly, lymphadenopathy or abnormalities in more than one blood-cell line raises leukaemia or marrow failure.
- Check full blood count and film, coagulation, renal and liver profile, CRP and cultures according to illness; use lumbar puncture only after stabilisation and contraindication assessment.
- Safeguarding remains part of the differential when petechiae, bruises or patterned lesions are unexplained, protected-site or inconsistent with development; infection and inflicted injury can coexist.
Key red flags
Rapidly spreading purpura with shock, drowsiness or severe limb pain is meningococcal disease until urgently treated.
Cold extremities, prolonged refill and tachycardia may precede hypotension and visible purpura in a septic child.
Mucosal bleeding, haematuria, gastrointestinal bleeding or neurological symptoms indicate bleeding beyond the skin.
Pallor, persistent fever, night sweats, bone pain, nodes or organomegaly suggests leukaemia or marrow failure.
Severe abdominal or testicular pain with IgA vasculitis can indicate bowel or scrotal complication.
Hypertension, proteinuria or impaired renal function after palpable purpura needs urgent nephrology-aware review.
Unexplained petechiae on protected sites or an inconsistent account requires a safeguarding response without delaying medical care.
Spreading non-blanching lesions with altered consciousness, shock or severe pain requires immediate sepsis treatment.
Investigation priorities
Determine immediate sepsis risk and document distribution, spread, palpability, bleeding and safeguarding clues.
Management branches
Non-blanching rash accompanies abnormal physiology, altered consciousness, severe pain, meningism or rapid spread.
- Use ABCDE, obtain IV or IO access and call senior paediatric and critical-care teams while documenting rash progression.
- Take cultures and essential bloods if immediate, give ceftriaxone or cefotaxime under the current pathway and resuscitate perfusion.
- Transfer urgently, defer unsafe lumbar puncture and monitor coagulation, limbs and organ function in high-dependency care.