Urgent Evaluation for Erythromelalgia with Possible Secondary Cause
This patient requires immediate workup for erythromelalgia (EM), a rare neurovascular disorder characterized by burning pain, erythema, and warmth in the extremities—but the green discharge is highly atypical and demands urgent evaluation for superimposed infection or an alternative/concurrent diagnosis.
Critical First Steps
The combination of scaling skin, green discharge, burning pain, and new hot-and-cold sensations in the extremities raises two immediate concerns:
- Primary concern: Erythromelalgia - The burning pain and temperature dysregulation (hot/cold sensations) in hands and feet are classic for EM 1, 2
- Urgent concern: Superimposed infection - Green discharge is NOT typical of EM and suggests bacterial infection (likely Pseudomonas given the green color)
Immediate Diagnostic Workup Required
Obtain bacterial/viral/fungal cultures immediately from the areas with green discharge 3. This is critical because:
- EM itself does not cause purulent discharge
- Green discharge suggests Pseudomonas or other bacterial infection
- Infection can complicate and worsen underlying EM
Order complete blood count (CBC) with differential urgently 4, 5. This is non-negotiable because:
- Secondary EM is associated with myeloproliferative disorders (polycythemia vera, essential thrombocythemia, chronic myelogenous leukemia) in the majority of cases
- Symptoms of EM can precede diagnosis of myeloproliferative disease by a median of 2.5 years 4
- Any abnormal hemoglobin, WBC, platelet count, or immature cells should trigger hematology referral
- Annual CBC monitoring is required even if initial workup is negative 5
Immediate Management Algorithm
Step 1: Address Infection (if cultures positive)
- Start appropriate antibiotics based on culture results
- Consider antiseptic solutions (silver sulfadiazine 1% or polyhexanide 0.02%-0.04%) for any erosions or ulcerations 3
Step 2: Symptomatic Treatment for EM
Non-pharmacological (start immediately):
- Avoid heat triggers: no hot showers, excessive heat exposure, or strenuous exercise 1
- Cooling measures: elevation of extremities, use of fans (NOT ice water immersion—this causes chronic immersion injury) 6, 5
- Avoid mechanical stress: cushioned shoes, avoid prolonged walking 3
Pharmacological first-line:
- Aspirin 325mg daily - This provides dramatic improvement in most patients with either primary or secondary EM 4. This is the most evidence-based first-line treatment.
- Topical lidocaine 5% cream or patches for localized burning pain 3, 6
Step 3: If No Response After 2 Weeks
Escalate to sodium channel blockers:
- Mexiletine (oral sodium channel blocker) - Proven effective in multiple case reports, particularly in primary EM 6. Start after checking baseline liver function tests and monitoring levels.
- Alternative: IV lidocaine infusion followed by transition to oral mexiletine if hospitalization is warranted 6, 7
Step 4: Refractory Cases
Consider:
- Sympathetic nerve blocks with lidocaine and triamcinolone 7
- Dorsal root ganglion (DRG) stimulation for severe, treatment-refractory cases 8
- Referral to pain management and dermatology
Critical Pitfalls to Avoid
Do NOT allow chronic ice water immersion - While patients desperately seek this relief, it causes chronic immersion injury to skin 6
Do NOT miss myeloproliferative disorders - The median time from EM symptoms to diagnosis of underlying blood disorder is 2.5 years. Missing this can delay treatment of a potentially life-threatening condition 4
Do NOT dismiss the green discharge - This is NOT part of EM and requires separate evaluation and treatment
Do NOT confuse with cellulitis or CRPS - The intermittent nature, heat triggers, and relief with cooling distinguish EM from these conditions 1
Differential Considerations
The scaling skin with green discharge could represent:
- Superimposed bacterial infection (most likely Pseudomonas)
- Hand-foot skin reaction (HFSR) if patient is on chemotherapy agents (BRAF inhibitors, MEK inhibitors, multikinase VEGFR inhibitors) 3
- Palmar-plantar erythrodysesthesia syndrome (PPES) if on cytotoxic chemotherapy 3
Ask specifically about: Any cancer diagnosis, chemotherapy (5-FU, capecitabine, doxorubicin, taxanes, sorafenib, sunitinib, regorafenib), or targeted therapy 3. If positive, this completely changes management to focus on drug-induced toxicity rather than primary EM.
Monitoring Plan
- Reassess in 2 weeks after initiating aspirin and supportive care
- Annual CBC indefinitely to monitor for myeloproliferative disorders 5
- Liver function tests if starting mexiletine
- Culture results within 48-72 hours to guide antibiotic therapy
The hot-and-cold sensations represent the neurovascular dysfunction characteristic of EM, with alternating vasodilation (hot) and compensatory vasoconstriction (cold) 2. This axonal dysfunction is the hallmark pathophysiology of the condition.