📋 History Summary

Presenting Complaint

History of Presenting Complaint

Past Medical History

• No previous skin problems
• No known allergies

Drug History

• No current medications

Social / Exposure History

• Contact with wild or stray animals
• Possible zoonotic exposure

⚠️ Clinical Impression (Preliminary)

• Grouped vesicles on an erythematous base
• Unilateral, localized distribution
• Gradual onset over days
• Fever + headache + malaise (systemic prodrome)
• Contact with animals

1. Herpes Zoster (Shingles) - grouped vesicles in a dermatomal pattern with prodromal fever/malaise - top differential
2. Insect/arthropod bites from animal contact (flea, mite) - multiple grouped lesions
3. Contact dermatitis (plant/animal contact) - though systemic symptoms make this less likely
4. Rickettsia / zoonotic infection - given animal contact + systemic features

Recommendation: This warrants prompt clinical evaluation. The systemic symptoms (fever, headache, malaise) alongside a vesicular rash are a red flag combination requiring urgent assessment to rule out serious infections.

📋 Updated & Complete History Summary

Presenting Complaint

History of Presenting Complaint

Past Medical & Vaccination History

• Chickenpox (varicella) in childhood - confirmed
• No other skin problems
• No immunocompromising conditions

Drug History

• No current medications

Social History

• Under 20 years old
• Contact with wild/stray animals

🔍 Clinical Impression

Note: Zoster in a patient under 20 with no immunosuppression is uncommon but does occur - it warrants checking for an underlying immune deficiency (e.g. undiagnosed HIV, hematological malignancy) even if none is currently known.

🦠 Herpes Zoster (Shingles) - Latest Clinical Treatment Guidelines

1. General Treatment Goals

• Limit the extent, duration, and severity of the rash and acute pain
• Prevent visceral/CNS dissemination
• Prevent or reduce Post-Herpetic Neuralgia (PHN) - the most common serious complication

2. Antiviral Therapy - The Cornerstone of Treatment

Timing (Critical)

Start within 72 hours of rash onset for maximum benefit. This is the single most important factor.

• Even after 72 hours, antivirals should still be started if: new vesicles are still appearing, signs of dissemination exist, the patient has herpes zoster ophthalmicus/oticus, or the patient is immunocompromised (S2k Guideline Recommendation #25, 2025).

Drug Options and Dosing

Valacyclovir and Famciclovir are preferred over Acyclovir due to better oral bioavailability, higher blood levels, and more convenient 3x/day dosing (vs. Acyclovir's 5x/day). - Fitzpatrick's Dermatology

A 2023 network meta-analysis (PMID: 37535772) confirmed Valacyclovir and Famciclovir are superior to Acyclovir for pain reduction in immunocompetent patients.

3. Indications for IV Antiviral Therapy

• Herpes zoster of the head and neck (especially elderly)
• Hemorrhagic/necrotic lesions, multisegmental involvement
• Immunosuppressed patients with any severity
• Visceral or CNS involvement (including zoster-associated vasculitis)
• Acute retinal necrosis (Acyclovir IV 10mg/kg 3x/day x 7-10 days, then oral for 3-4 months)

4. Pain Management

5. Topical Skin Care

• Cool compresses, calamine lotion, cornstarch, or baking soda to soothe lesions
• Do NOT use occlusive ointments, topical steroids, or topical antivirals (ineffective)
• If bacterial superinfection occurs: warm soaks; systemic antibiotics if cellulitis develops
• Keep lesions covered with appropriate dressings until no longer infectious

6. When to Refer Urgently (within 24 hours)

• Diagnosis is unclear or atypical presentation
• Patient is pregnant without confirmed prior VZV history
• Immunocompromised patient
• Ophthalmic zoster (eye/forehead involvement)
• Multidermatomal rash
• Signs of CNS or visceral involvement
• No response to treatment or worsening

7. Special Note for This Patient (Under 20, No Immunosuppression)

• Age < 50 with no risk factors - symptomatic treatment alone is acceptable OR antivirals may be given
• However, given systemic symptoms (fever, headache, malaise), antiviral treatment is recommended
• Zoster in a patient under 20 without known immunosuppression should prompt screening for occult immunodeficiency (HIV, haematological malignancy)

8. Prevention - Vaccination

• Shingrix (recombinant zoster vaccine, RZV) is the only recommended vaccine - 2-dose series, ~97% efficacy
• Zostavax (live attenuated) was deregistered in Australia in December 2024
• Recommended for adults ≥ 50 years and immunocompromised individuals ≥ 18 years

Bottom line for this patient: Oral Valacyclovir 1g 3x/day for 7 days should be started as soon as possible (ideally within 72 hours of rash onset), combined with adequate analgesia. Evaluate for underlying immunodeficiency given the atypical young age presentation.

What's included in the handout:

Itching and Burning Relief for Shingles

Itching - Topical Options (Apply Directly to Skin)

Avoid hot water - heat worsens itch and inflammation.

Burning / Nerve Pain - What Actually Works

• Gabapentin (Neurontin) - first-line for nerve burning; a 2024 systematic review (PMID: 38912892) confirmed efficacy for acute zoster neuralgia
• Pregabalin - similar to gabapentin, slightly faster onset
• Amitriptyline (low dose, 10-25mg at night) - a tricyclic antidepressant that dampens nerve pain signals; also helps sleep
• Paracetamol / Ibuprofen - for mild-moderate burning, take regularly (not just when severe)

• Lidocaine 5% patch - numbs nerve endings directly at the skin; applied for 12 hours on, 12 hours off
• Capsaicin cream - desensitizes nerve endings over time; causes initial warmth/burning so best used after the rash has healed, mainly for PHN

What NOT to Use

• Topical antiviral creams (e.g. acyclovir cream) - do NOT work for shingles, only for cold sores
• Topical steroid creams - can worsen the infection
• Topical antihistamine creams (e.g. diphenhydramine cream) - poor absorption, risk of sensitization
• Scratching - breaks blisters open, risks bacterial superinfection and scarring

Oral Antihistamines for Itch

Quick Summary by Symptom