Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.
Petechiae and non-blanching rash
Paediatrics and child health · UK scope · Sources checked 27 Aug 2026 · Clinical review pending
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Unwell child with non-blanching rash
Toxic appearance, shock, altered consciousness, severe limb pain, meningism or rapidly spreading petechiae or purpura can indicate meningococcal disease or another invasive bacterial infection.
Action: Use ABCDE, call senior paediatric and critical-care support, obtain cultures and blood tests only if this does not delay care, give prompt guideline-directed parenteral ceftriaxone or cefotaxime and resuscitate. Arrange urgent transfer and do not wait for lumbar puncture, imaging or rash progression.
Overview
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.
A non-blanching rash represents blood outside vessels or within abnormal vessels and ranges from harmless pressure petechiae to fulminant meningococcal sepsis. First decide whether the child is physiologically unwell. Assess airway, work of breathing, pulse, capillary refill, blood pressure, temperature, consciousness, urine and pain. Expose fully in good light, including conjunctivae, mouth, palms, soles and pressure areas, and document evolution and distribution on varied skin tones.
Petechiae are small pinpoint lesions; purpura are larger and ecchymoses larger still. Blanching pressure helps distinguish erythema but is imperfect in early or deeply pigmented lesions. Palpable lesions suggest vessel-wall inflammation, whereas flat lesions can follow thrombocytopenia, coagulation failure, infection or pressure. A rapidly enlarging purpuric lesion with systemic decline is an emergency regardless of terminology or exact millimetres.
Practice
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Paediatrics and child healthOriginal SBA
Purpura with physiological deterioration
A febrile 4-year-old has severe leg pain, cold mottled hands, prolonged capillary refill, drowsiness and a rapidly spreading non-blanching rash. What is the most appropriate immediate management?
Sources and review status5 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.
Meningococcal disease can progress within hours. Early features include fever, irritability, leg pain, cold hands or feet, pallor, tachycardia and prolonged refill; neck stiffness may be absent. Purpura, altered consciousness, hypotension or a spreading non-blanching rash are late high-risk signs. Follow NICE bacterial meningitis and meningococcal disease guidance: give parenteral ceftriaxone or cefotaxime promptly in hospital and do not postpone for lumbar puncture or imaging.
In primary care or community settings, call emergency transport immediately. Pre-hospital benzylpenicillin may be recommended when meningococcal disease is strongly suspected and giving it does not delay transfer, but allergy and current local emergency guidance apply. Provide oxygen and resuscitation within competence. Communicate time of rash onset, antibiotic and fluid given and change during transfer. A transient improvement after antipyretic does not lower risk.
Immune thrombocytopenia often follows viral illness in an otherwise well child and produces petechiae, bruises and mucosal bleeding with isolated thrombocytopenia. Examine for liver, spleen and lymph nodes and ask about bone pain, fever, weight loss and medicines. Blood film review is essential because blasts, anaemia, neutropenia or organomegaly argues against uncomplicated ITP. Management depends on bleeding, not a platelet number alone; severe mucosal or intracranial bleeding needs urgent haematology therapy.
IgA vasculitis causes non-thrombocytopenic palpable purpura, usually on buttocks and lower limbs, with arthritis or arthralgia, colicky abdominal pain and renal involvement. Check urinalysis, blood pressure and renal function. Severe abdominal pain, GI bleeding, testicular pain, neurological features or hypertension needs urgent care. Renal disease can appear after the rash improves, so scheduled urine and blood-pressure surveillance is required rather than discharge after one normal sample.
Mechanical petechiae follow intense coughing, vomiting, crying or Valsalva and are usually confined to face, neck and upper chest above the nipple line. The child is well, lesions do not spread and the history is clear. Still examine the whole child and ask about strangulation, choking, seizures and safeguarding. Local pressure from tourniquets, tight straps or suction can create a patterned distribution that should match the explanation.
Other mechanisms include viral infection, sepsis-related disseminated intravascular coagulation, liver disease, vitamin-K deficiency, inherited coagulation disorders, marrow failure, leukaemia, medicine effects and infective endocarditis. Fever with pallor, persistent bone pain, lymphadenopathy, hepatosplenomegaly or more than one abnormal cell line requires urgent paediatric and haematology assessment. A normal CRP early in illness cannot exclude invasive infection.
Investigations follow risk. An ill child needs cultures, blood count and film, coagulation, fibrinogen, electrolytes, renal and liver profile, glucose, gas, lactate and CRP while antibiotics and resuscitation proceed. A well child with a convincing mechanical pattern may need no blood test after senior review. Suspected ITP needs count and film; suspected IgA vasculitis needs urine and blood pressure. Lumbar puncture is delayed when shock, extensive purpura, coagulopathy, reduced consciousness or raised intracranial pressure makes it unsafe.
Discharge only when serious infection and haematological or safeguarding disease have been considered, observations are stable and caregivers have explicit return advice. Ask them to return urgently for spreading rash, fever, drowsiness, limb pain, bleeding, abdominal pain, dark urine or reduced urine. Arrange the correct follow-up: ITP bleeding review, IgA vasculitis renal surveillance or repeat blood count and specialist assessment for unresolved abnormalities.
Key points
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.
Aetiology
01
Invasive bacterial infection
Meningococci and other bacteria damage endothelium and activate coagulation, causing capillary leakage, thrombosis, consumption and purpura.
02
Platelet deficiency or dysfunction
Immune destruction, marrow failure, medicines or inherited platelet disease permits superficial skin and mucosal bleeding after minor vessel stress.
03
Small-vessel inflammation
IgA-mediated leukocytoclastic vasculitis causes palpable dependent purpura with possible joint, bowel and significant glomerular kidney involvement.
04
Pressure and venous rupture
Coughing, vomiting, seizures, suction or compression acutely raises local venous pressure and ruptures nearby superficial capillaries.
Pathophysiology
1
Endotoxin-driven coagulopathy
Inflammatory and coagulation cascades produce disseminated microvascular thrombosis, platelet consumption, bleeding and progressive systemic organ hypoperfusion.
2
Primary haemostatic failure
Low or ineffective platelets impair the initial plug, causing petechiae, easy bruising and wet mucosal bleeding.
3
Vessel-wall leakage
Inflamed post-capillary venules allow circulating erythrocytes to escape and create palpable purpura in gravity-dependent skin areas.
4
Marrow replacement
Leukaemic or infiltrative cells displace normal blood production, combining thrombocytopenia with anaemia, neutropenia and systemic tissue involvement.
Clinical features and red flags
Meningococcal physiology
Fever, limb pain, cold hands or feet, prolonged refill, tachycardia and increasing purpura indicate invasive disease.
ITP phenotype
Petechiae, bruising and mucosal bleeding occur in an otherwise well child with isolated low platelets and normal film morphology.
IgA vasculitis pattern
Palpable purpura over buttocks and legs accompanies ankle or knee pain, colicky abdomen, haematuria or hypertension.
Mechanical petechiae
Fine lesions remain above the nipple line after coughing or vomiting in a well child and do not progress.
Marrow warning pattern
Pallor, bone pain, fever, weight loss, nodes, hepatosplenomegaly or multiple cytopenias suggests malignancy or failure.
Rapid purpuric deteriorationRed flag
Spreading non-blanching lesions with altered consciousness, shock or severe pain requires immediate sepsis treatment.
Red flags requiring action
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.
Investigations
01First-line physiological and full-skin assessmentFirst stepFirst line
Why
Determine immediate sepsis risk and document distribution, spread, palpability, bleeding and safeguarding clues.
Interpretation and limitations
Instability or progression triggers treatment before tests; a stable child can proceed to mechanism-directed investigation.
02Full blood count and blood film
Why
Measure platelets and other lines and look for blasts, fragmentation, infection or marrow failure.
Interpretation and limitations
Isolated thrombocytopenia with an otherwise normal film supports ITP; multiple abnormalities or blasts require urgent haematology.
03Coagulation and fibrinogen
Why
Detect disseminated intravascular coagulation, liver-related clotting failure or a primary coagulation disorder.
Interpretation and limitations
Prolonged tests, falling fibrinogen and thrombocytopenia in an ill child support consumptive coagulopathy and severe sepsis.
04Cultures, gas, lactate and organ profile
Why
Investigate bacterial sepsis and quantify perfusion, renal, hepatic and metabolic organ dysfunction.
Interpretation and limitations
Obtain promptly but never let normal early inflammatory markers or sampling delay antibiotic and circulatory treatment.
05Urinalysis and blood pressure
Why
Detect renal involvement in IgA vasculitis at presentation and throughout scheduled surveillance.
Interpretation and limitations
Haematuria, proteinuria or hypertension changes follow-up intensity and may require renal referral even after rash resolution.
06Lumbar puncture when safe and indicated
Why
Confirm meningitis after stabilisation when there is no shock, coagulopathy, extensive purpura or raised intracranial-pressure concern.
Interpretation and limitations
Antibiotics precede lumbar puncture when delay or contraindication exists; a deferred test must never stall emergency treatment.
Differential diagnosis
01
Meningococcal sepsis
Fever, limb pain, cold peripheries, shock, altered consciousness or rapidly spreading purpura requires immediate antibiotic and resuscitation treatment.
02
Immune thrombocytopenia
A well child has bruising, petechiae and isolated thrombocytopenia without organomegaly, persistent fever or other cytopenias.
03
IgA vasculitis
Palpable dependent purpura with abdominal, joint or renal features typically occurs despite a normal circulating platelet count.
04
Leukaemia or marrow failure
Pallor, bone pain, fever, nodes, organomegaly and abnormalities across several blood-cell lines indicate broader marrow disease.
05
Mechanical or inflicted injury
Pressure-related lesions match a clear event and distribution; unexplained protected-site or patterned marks need safeguarding assessment.
Management
01Unwell childTreat invasive disease immediatelyFirst stepNon-blanching rash accompanies abnormal physiology, altered consciousness, severe pain, meningism or rapid spread.+
1Use ABCDE, obtain IV or IO access and call senior paediatric and critical-care teams while documenting rash progression.
2Take cultures and essential bloods if immediate, give ceftriaxone or cefotaxime under the current pathway and resuscitate perfusion.
3Transfer urgently, defer unsafe lumbar puncture and monitor coagulation, limbs and organ function in high-dependency care.
02Possible ITPGrade bleeding before treating a numberThe child is well with petechiae or bruises and apparently isolated thrombocytopenia.+
1Examine nodes, liver and spleen and ask about bone pain, fever, medicines and wet mucosal bleeding.
2Review full blood count and film before labelling ITP and seek haematology input for atypical findings or significant bleeding.
3Use observation or treatment based on bleeding and circumstances, give activity and medicine precautions and arrange follow-up.
03Possible IgA vasculitisLook beyond the skin to kidney and bowelPalpable lower-limb purpura accompanies joint, abdominal or urinary symptoms with normal platelets.+
1Measure blood pressure, urinalysis, renal function and abdominal and testicular features and exclude surgical complications.
2Provide analgesia and hydration and involve paediatrics urgently for severe pain, bleeding, renal change or systemic illness.
3Schedule urine and blood-pressure surveillance after rash resolution because nephritis can emerge later.
04Well mechanical patternConfirm a benign distribution safelyPetechiae are confined above the nipple line after a clear episode of coughing, vomiting or pressure and the child is well.+
1Complete observations and whole-skin, oral, abdominal and safeguarding examination and confirm lesions are not progressing.
2Use senior clinical judgement to avoid unnecessary blood tests only when history, distribution and physiology are fully reassuring.
3Give return advice for fever, spread, bleeding, lethargy or new pain and document the proposed mechanism clearly.
Key medicines and prescribing safety2 treatments · regimens, roles and cautions+
Provides rapid bactericidal treatment for suspected meningococcal disease or bacterial meningitis before organism confirmation.
Ceftriaxone or cefotaxime
Give the current age- and weight-specific parenteral dose immediately under NICE and local paediatric meningococcal guidance; use cefotaxime when ceftriaxone is contraindicated, including relevant neonatal calcium considerations.
Do not delay for lumbar puncture or imaging, document allergy and prior antibiotic, and follow neonatal, renal, meningitis and resistance-specific local advice.
Begins antimicrobial treatment before hospital arrival when transport time and clinical suspicion make delay dangerous.
Pre-hospital benzylpenicillin
When meningococcal disease is strongly suspected outside hospital, give the current age-based emergency dose if local guidance recommends it and administration will not delay ambulance transfer.
Immediate transfer and ABCDE take priority; follow severe allergy guidance and tell the receiving team the exact dose and time.
Complications
01
Septic shock and multiorgan failure
Progressive endothelial injury, capillary leak and coagulopathy cause refractory shock, limb ischaemia, adrenal injury and death.
02
Intracranial or mucosal haemorrhage
Severe thrombocytopenia or coagulation failure can produce gastrointestinal, pulmonary or brain bleeding despite limited skin findings.
03
IgA nephritis
Glomerular inflammation can cause haematuria, proteinuria, hypertension and persistent long-term renal impairment after the purpura resolves.
04
Bowel ischaemia or intussusception
IgA vasculitis oedema and haemorrhage can cause severe abdominal pain, bleeding, obstruction and a surgical emergency.
05
Delayed malignancy diagnosis
Assuming all petechiae are viral or ITP can postpone recognition of leukaemia, marrow failure and infection-related cytopenia.
Monitoring and follow-up
Repeat observations and inspect rash spread frequently in any child retained for assessment because deterioration can occur within hours.
Monitor perfusion, lactate, urine, coagulation and limb viability during invasive meningococcal disease and purpura fulminans.
In ITP, track bleeding phenotype, platelet recovery and medication or activity risks rather than chasing a normal count immediately.
In IgA vasculitis, perform scheduled urinalysis and blood pressure after skin symptoms settle according to the paediatric pathway.
Review full blood count abnormalities to resolution and escalate persistent cytopenia, blasts or systemic features.
Document safeguarding findings, information sharing and the agreed safety plan when the distribution or account is concerning.
Give caregivers written emergency return criteria for fever, spreading rash, drowsiness, severe pain, bleeding or reduced urine.
Special situations
The glass test is limited
Pressure demonstrates blanching but cannot replace good illumination, full exposure and assessment of a child's circulation.
Hypotension is late
Children maintain blood pressure through vasoconstriction, so cold limbs and prolonged refill can signal shock earlier.
ITP is a film diagnosis too
Isolated platelet reduction supports it only after blasts and abnormalities in other blood lines are excluded.
Purpura can outlast kidney risk
IgA vasculitis nephritis may appear after the rash improves, making scheduled urine and pressure checks essential.
Distribution can explain pressure
Facial and upper-chest petechiae after vomiting are reassuring only when the child and full examination are otherwise normal.
Common pitfalls
01
Reassuring from a glass test while ignoring abnormal physiology.
02
Waiting for purpura or neck stiffness before treating meningococcal disease.
03
Delaying antibiotics for lumbar puncture, imaging or a normal early CRP.
04
Diagnosing ITP without reviewing the blood film and other cell lines.
05
Treating a platelet number while ignoring mucosal and neurological bleeding.
06
Discharging IgA vasculitis without blood pressure, urinalysis and renal surveillance.
07
Calling petechiae mechanical without full-skin and safeguarding assessment.
08
Missing leukaemia when bruising is accompanied by pallor, bone pain or organomegaly.