7.2 Pediatric Dermatologic Emergencies & Rashes
Key Takeaways
- Meningococcemia presents with rapidly spreading non-blanching petechiae and purpura fulminans requiring immediate empiric IV antibiotics, droplet isolation, and fluid resuscitation.
- Stevens-Johnson Syndrome (<10% BSA) and Toxic Epidermal Necrolysis (>30% BSA) feature mucosal involvement and epidermal sloughing (positive Nikolsky sign), requiring burn-level wound care.
- Staphylococcal Scalded Skin Syndrome (SSSS) is caused by exfoliative toxins and completely spares mucous membranes, distinguishing it from SJS/TEN.
- Severe angioedema with airway compromise mandates immediate intramuscular epinephrine as the primary life-saving intervention.
7.2 Pediatric Dermatologic Emergencies & Rashes
Pediatric dermatologic conditions range from benign viral exanthems to life-threatening dermatologic emergencies. Recognizing skin signs that indicate systemic toxicity, vascular collapse, or extensive mucosal and epidermal destruction is a core competency for the Certified Pediatric Emergency Nurse (CPEN). Rapid triage, immediate stabilization, and targeted nursing interventions are essential when caring for pediatric patients with high-risk rashes.
Life-Threatening Pediatric Rashes: Diagnostic Matrix
| Emergency Condition | Primary Etiology / Trigger | Characteristic Cutaneous Lesions | Mucosal Involvement | Distinctive Clinical & Laboratory Features |
|---|---|---|---|---|
| Meningococcemia & Purpura Fulminans | Neisseria meningitidis bacteremia & endotoxemia. | Non-blanching petechiae progressing rapidly to ecchymotic purpura and tissue necrosis. | Rare; cutaneous microvascular thrombosis dominates. | Glass test positive (does not blanch); systemic DIC, septic shock, rapid hemodynamic collapse. |
| Stevens-Johnson Syndrome (SJS) | Medication reaction (sulfonamides, antiepileptics) or M. pneumoniae. | Erythematous macules with purpuric centers, vesiculobullous lesions covering < 10% BSA. | Present (≥ 2 mucosal sites: eyes, oral cavity, genitalia). | Positive Nikolsky sign; full-thickness epidermal detachment, severe systemic toxicity. |
| Toxic Epidermal Necrolysis (TEN) | Severe drug reaction (lamotrigine, NSAIDs, allopurinol, antibiotics). | Widespread painful erythema leading to sheet-like epidermal sloughing covering > 30% BSA. | Present (Severe, confluent involvement of oral, ocular, GI tract). | Positive Nikolsky sign; high mortality rate, massive fluid/electrolyte loss resembling severe burn. |
| Staphylococcal Scalded Skin Syndrome (SSSS) | Staphylococcus aureus exfoliative toxins A & B. | Diffuse tender erythroderma, superficial flaccid bullae, skin wrinkling and peeling. | ABSENT (Spares mucous membranes completely). | Positive Nikolsky sign; intraepidermal split at zona granulosum; typically affects neonates & children < 5 yrs. |
| Severe Urticaria & Angioedema | IgE-mediated type I hypersensitivity or complement activation. | Pruritic, transient, raised erythematous wheals with central pallor; deep dermal swelling. | Present (Lip, tongue, uvular, and laryngeal edema). | Risk of asphyxiation; stridor, dyspnea; requires immediate intramuscular epinephrine. |
Meningococcemia & Purpura Fulminans
Meningococcemia is an acute, life-threatening bacteremia caused by the Gram-negative diplococcus Neisseria meningitidis. Bacterial endotoxins trigger massive inflammatory cytokine release, endothelial damage, widespread capillary leak, and severe Disseminated Intravascular Coagulation (DIC).
Clinical Progression & Assessment
- Early Stage: Nonspecific flu-like symptoms, fever, irritability, cold extremities, and leg pain.
- Dermatologic Progression: Starts as small, subtle, erythematous macules or petechiae on the trunk and extremities. Applying pressure with a clear glass tumbler (the glass test) reveals that petechiae do not blanch.
- Purpura Fulminans: Within hours, petechiae coalesce into dark purple, ecchymotic, ischemic skin lesions with central cutaneous necrosis caused by microvascular thrombosis.
Emergency Nursing Priorities
- Immediate Isolation: Institute Droplet Precautions immediately upon suspicion.
- Aggressive Hemodynamic Resuscitation: Establish double IV/IO access; administer rapid isotonic crystalloid boluses (20 mL/kg) for septic shock.
- Empiric Antimicrobial Therapy: Administer high-dose IV broad-spectrum antibiotics (Ceftriaxone 100 mg/kg or Cefotaxime plus Vancomycin) without delay.
Critical Rule: Diagnostic procedures such as lumbar puncture must NEVER delay the administration of parenteral antibiotics in a hemodynamically unstable child.
Stevens-Johnson Syndrome (SJS) & Toxic Epidermal Necrolysis (TEN)
SJS and TEN represent points on a spectrum of severe, immune-mediated, life-threatening cutaneous adverse reactions characterized by extensive keratinocyte apoptosis, epidermal detachment, and mucosal erosion.
Spectrum Classification
- SJS: Epidermal detachment involving less than 10% of total body surface area (BSA).
- SJS/TEN Overlap: Epidermal detachment involving 10% to 30% of BSA.
- TEN: Epidermal detachment involving greater than 30% of BSA.
Key Clinical Signs
- Prodrome: High fever, malaise, sore throat, and cough preceding skin eruption by 1 to 3 days.
- Skin Lesions: Atypical targetoid macules that coalesce into flaccid bullae.
- Nikolsky Sign: Gentle lateral pressure applied to unblistered erythematous skin causes the outer layer of epidermis to slide off and detach.
- Mucosal Erosion: Severe, painful hemorrhagic crusting and ulceration involving at least two mucous membrane sites (oral mucosa, conjunctiva, urethral meatus, tracheobronchial tree).
Emergency Management & Nursing Care
- Admission: Direct transfer to a certified Burn Center or Pediatric Intensive Care Unit (PICU).
- Fluid & Electrolyte Support: Calculate fluid requirements using modified burn formulas; monitor urine output closely (target > 1 mL/kg/hr).
- Ophthalmology Consultation: Urgent, daily ophthalmologic evaluation with topical lubricants and amniotic membrane grafting to prevent corneal ulceration, symblepharon formation, and permanent blindness.
- Wound Care: Meticulous non-adherent dressing application; strictly avoid adhesive tapes or aggressive skin rubbing.
Staphylococcal Scalded Skin Syndrome (SSSS)
SSSS is an exfoliative dermatosis primarily affecting neonates and young children under 5 years of age. It is caused by systemic hematogenous dissemination of exfoliative toxins A and B produced by localized Staphylococcus aureus infections (e.g., bullous impetigo, conjunctivitis, or umbilical omphalitis).
Pathophysiology & Diagnostic Differentiation
The exfoliative toxins specifically cleave desmoglein-1, a cell adhesion protein located exclusively in the superficial zona granulosum of the epidermis.
- Clinical Appearance: Starts with facial erythema and perioral crusting, rapidly spreading to a generalized tender "sunburn-like" erythroderma. The skin becomes wrinkled, forming large, clear, flaccid bullae.
- Nikolsky Sign: Positive (superficial skin peels easily with light pressure).
- Mucosal Sparing: SSSS completely spares mucous membranes. Unlike SJS/TEN, the lips, conjunctiva, and genitalia remain unaffected. Furthermore, because the cleavage plane is superficial, healing occurs within 7 to 14 days without scarring.
Treatment
- Parenteral antistaphylococcal antibiotics (Nafcillin, Oxacillin, or Cefazolin; Vancomycin if community-acquired MRSA is prevalent).
- Gentle skin care, barrier ointments (petroleum jelly), and effective pain control.
Severe Urticaria & Angioedema
Urticaria (hives) and angioedema represent cutaneous and subcutaneous vascular reactions. While isolated urticaria is benign, angioedema involving the upper respiratory tract is a fatal airway emergency.
Assessment
- Urticaria: Raised, circumscribed, intensely pruritic, erythematous plaques with central edema that blanch with pressure and migrate across skin locations over 24 hours.
- Angioedema: Non-pruritic, non-pitting, asymmetric swelling of the deep dermis and subcutaneous tissues, commonly affecting the lips, tongue, uvula, periorbital tissue, hands, and feet.
Airway Risk & Immediate Interventions
- Airway Compromise Signs: Hoarseness, inspiratory stridor, tongue swelling, difficulty swallowing, or feeling of "throat tightness."
- First-Line Pharmacotherapy: If airway angioedema, stridor, wheeze, or hypotension is present, treat as anaphylaxis immediately with IM epinephrine using the dosing and monitoring protocol in Section 10.3 (do not delay for antihistamines or steroids).
- Secondary Agents: H1 antihistamines (Diphenhydramine, Cetirizine), H2 antihistamines (Famotidine), and IV corticosteroids (Methylprednisolone) to reduce biphasic reaction risk.
Pediatric Cellulitis vs. Cutaneous Abscess
| Characteristic | Cellulitis | Cutaneous Abscess |
|---|---|---|
| Definition | Acute spreading bacterial infection of the deep dermis and subcutaneous fat. | Localized collection of pus within the dermis and deeper skin tissues. |
| Physical Exam | Poorly demarcated erythema, warmth, edema, and tenderness; no fluctuance. | Painful, tender, erythematous nodule with fluctuance (boggy center). |
| Primary Pathogens | Group A Streptococcus, Staphylococcus aureus. | Community-Acquired Methicillin-Resistant S. aureus (CA-MRSA). |
| Primary Treatment | Systemic antimicrobial therapy; elevate affected extremity. | Incision and Drainage (I&D) is primary; antibiotics reserved for high-risk features. |
| Nursing Actions | Mark leading border of erythema with surgical marker; monitor for spreading. | Assist with I&D, obtain wound culture, apply warm compresses post-procedure. |
Communicable Childhood Diseases and MDRO Precautions
Special Considerations includes communicable diseases—classic childhood infections, multidrug-resistant organisms, and emerging pathogens—because isolation decisions begin at triage.
High-Consequence Childhood Exanthems and Respiratory Pathogens
| Disease | Key ED Clues | Isolation Priority |
|---|---|---|
| Measles | High fever, cough/coryza/conjunctivitis, Koplik spots, descending maculopapular rash; unimmunized contacts | Airborne; notify public health |
| Varicella (chickenpox) | Pruritic vesicles in crops at multiple stages | Airborne + contact until lesions crusted |
| Pertussis | Paroxysmal cough, post-tussive emesis, apnea in infants | Droplet; treat index and consider prophylaxis for close contacts per public-health guidance |
| Mumps | Parotitis, orchitis risk in adolescents | Droplet |
Ask immunization status at triage (Domain 1 intake). Ill-appearing unimmunized children with measles-compatible illness should bypass open waiting areas when feasible.
Multidrug-Resistant Organisms (MRSA, VRE) and Emerging Infections
Community-associated MRSA drives many pediatric abscesses and some invasive infections—cover empirically when local prevalence is high. VRE precautions matter for known colonized patients and device-related infections. Emerging infectious diseases (novel influenza, viral hemorrhagic concerns, unusual travel-related syndromes) require early infection-prevention consultation, travel history, and escalation of PPE before confirmation when suspicion is high.
A 3-year-old girl is brought to the ED with a 6-hour history of high fever, extreme lethargy, and cold extremities. Physical examination reveals multiple non-blanching petechiae across her lower extremities and trunk, with several dark purple, ecchymotic purpuric lesions developing on her thighs. What is the most urgent nursing priority?
A 2-year-old child presents with generalized skin redness, tenderness to touch, and flaccid blisters covering his chest and arms. Gentle pressure on normal-appearing skin causes the top layer of skin to peel off. On oral inspection, the lips and buccal mucosa are pink, moist, and completely free of lesions or erosions. What diagnostic feature distinguishes this condition from Toxic Epidermal Necrolysis (TEN)?
An 11-year-old boy taking lamotrigine develops a high fever, severe conjunctivitis, and painful oral ulcerations, followed by widespread skin erythema and blistering. Physical assessment confirms epidermal detachment involving 35% of his total body surface area, with a positive Nikolsky sign. Which diagnosis and primary care setting are indicated?