Herpes Zoster (Shingles) | Dermatology & Pain Care in Hiroo & Ebisu, Tokyo | Yasashii Clinic

Medically Reviewed by: Takafumi Suzuki, MD — Specialist in Anesthesiology & Pain Medicine; Primary Care in Dermatology, Internal Medicine & Allergology Written by: Yasumasa Ohno — Business Development & Content Manager, Yasashii Clinic Hiroo Shirokane Last Updated: April 2, 2026

What You'll Learn in This Article

• What herpes zoster (shingles) is and why it happens — even decades after chickenpox

• The classic symptom progression: nerve pain first, then the distinctive rash

• Why the 72-hour treatment window matters so much

• How postherpetic neuralgia (PHN) develops and how to prevent it

• Vaccine options available in Japan for adults aged 50 and over

Herpes zoster — commonly called shingles — is caused by the reactivation of the varicella-zoster virus (VZV), the same virus responsible for chickenpox. Once you recover from chickenpox, the virus remains dormant in your nerve ganglia for life. When immunity declines — due to aging, stress, illness, or medication — the virus reactivates and travels along the nerve to the skin, producing the characteristic painful, one-sided rash.

The most important thing to know: starting antiviral treatment within 72 hours of symptom onset significantly reduces the risk of long-term nerve pain (postherpetic neuralgia). If you have unexplained one-sided pain or a new rash, this article — and a prompt visit to a doctor — is the right first step.

Table of Contents

1. What Is Herpes Zoster (Shingles)?

Herpes zoster is a viral infection caused by the reactivation of varicella-zoster virus (VZV) — the same pathogen that causes chickenpox (varicella). After the initial chickenpox infection, VZV establishes latency in the dorsal root ganglia and cranial nerve ganglia, where it can persist for decades without causing symptoms.

An estimated one in three people will develop shingles during their lifetime. In Japan, approximately 600,000–700,000 cases are diagnosed annually. The Hiroo, Ebisu, and Shirokane areas of Tokyo — home to many working professionals in their 40s–60s and a significant retiree population — see shingles presentations across a wide age range.

Common Misconceptions

• "Shingles only affects elderly people." While risk increases significantly after 50, anyone who has had chickenpox can develop shingles — including stressed or sleep-deprived adults in their 30s and 40s.

• "I never had chickenpox, so I can't get shingles." The vast majority of adults were infected with VZV in childhood, often without a clear recollection. Subclinical infection is common.

• "I can treat it with over-the-counter cream." Topical products cannot reach the virus replicating within nerve tissue. Prescription oral antiviral medication started within 72 hours of onset is the cornerstone of treatment.

2. Symptoms — From Pre-Rash Nerve Pain to the Rash Itself

Prodromal Phase (2–7 days before the rash) The first symptoms of shingles are often neurological, not dermatological:

• Unilateral burning, stabbing, or aching pain

• Tingling, itching, or hypersensitivity along a band of skin

• Mild fever, headache, or malaise

This phase is frequently misdiagnosed as a pulled muscle, pleuritis, cardiac pain, or dental pain — because there is no rash yet to point to the correct diagnosis.

Eruptive Phase

• A unilateral, dermatomal rash appears: red macules progressing to grouped vesicles (blisters)

• The rash follows the distribution of the affected dermatome and does not cross the midline

• Pain intensifies — often described as burning, electric-shock-like, or deep aching

• Most common locations: thoracic and lumbar dermatomes (trunk), trigeminal nerve distribution (face, forehead, eye area), cervical dermatomes (neck, arm)

Resolution Phase Vesicles crust over within 7–10 days and lesions fully clear within 3–4 weeks in most cases. Pain should diminish as the rash heals — but in some patients, it persists beyond the acute phase.

"I thought it was a pulled muscle — the left side of my back ached for about three days. Then a strip of red blisters appeared exactly where it hurt, and the pain became unlike anything I'd experienced. I couldn't sleep for a week." This progression — prodromal pain followed by dermatomal blisters — is the hallmark of herpes zoster.

3. Causes: VZV Reactivation and Its Triggers

Primary Infection (Chickenpox) VZV spreads by airborne droplets or direct contact with vesicular fluid. In non-immune individuals, it causes chickenpox. After recovery, the virus retreats to the sensory nerve ganglia.

Latency VZV DNA persists indefinitely in the dorsal root ganglia. Cell-mediated immunity (T-cell responses) keeps it suppressed. Aging naturally weakens this immune surveillance.

Reactivation Triggers

• Age: The most significant risk factor — incidence increases sharply after 50 and again after 70

• Psychological stress and sleep deprivation: Cortisol elevation suppresses T-cell function

• Physical illness or surgery: Immune diversion toward acute threats may reduce VZV surveillance

• Immunosuppressive medications: Corticosteroids, biologics, chemotherapy, and post-transplant immunosuppressants

• Underlying conditions: Diabetes, malignancy, HIV, autoimmune diseases

4. The Science Behind Shingles — How the Virus Reactivates

1. Latency: VZV DNA sits silently in dorsal root ganglion neurons, held in check by VZV-specific T-cells.

2. Immune decline triggers reactivation: Reduced T-cell surveillance allows VZV to begin replicating within the ganglion — causing neuronal inflammation and the prodromal pain.

3. Anterograde spread: Newly replicated virions travel along the sensory nerve axon toward the periphery.

4. Skin involvement: Virus reaches the skin supplied by that nerve, infecting keratinocytes and producing the characteristic dermatomal vesicular rash.

5. Nerve damage and PHN: Inflammatory destruction of nerve fibers during the acute phase can result in central sensitization and chronic neuropathic pain (PHN) that outlasts the rash.

Why the 72-hour window matters: Antiviral drugs (acyclovir, valacyclovir, famciclovir) inhibit VZV DNA polymerase, halting viral replication. They are most effective when the viral load is still rising. Starting treatment before peak viral replication reduces the extent of nerve damage — and therefore the risk of PHN.

5. How to Tell Shingles Apart from Similar Conditions

Red flags requiring same-day assessment:

• Ophthalmic zoster: Rash or pain around the eye, forehead, or tip of the nose — risk of keratitis, uveitis, and vision loss

• Ramsay Hunt syndrome: Ear pain, vesicles in or around the ear, facial palsy, vertigo — risk of permanent facial nerve damage

6. Diagnosis: What to Expect at the Clinic

Physical Examination A unilateral, dermatomal vesicular rash in the context of prodromal nerve pain is usually sufficient for clinical diagnosis without laboratory confirmation.

Medical History

• Onset, progression, and character of pain (burning? electric? aching?)

• Timeline: pain before rash? or simultaneous?

• Past chickenpox or VZV vaccination history

• Current medications, particularly immunosuppressants

• Underlying health conditions

Laboratory Tests (selected cases)

• VZV PCR (vesicular fluid or crust): definitive identification in atypical cases

• Serology (VZV IgM/IgG): supportive in ambiguous presentations

• Blood tests (CBC, CRP): assess for secondary infection or systemic involvement

Your First Visit — Step by Step

Book via LINE (24/7): https://line.me/R/ti/p/@744yxkjg
or call: +81-3-6456-4990
  ↓
Arrive at clinic (O-KA Building 3F, Ebisu)
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Intake form: symptom onset, location, pain character, medical history
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Examination — approx. 15–20 minutes
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Diagnosis + treatment plan explained in plain English
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Prescription / payment (cash or credit card)

Bring: Insurance card (or My Number Card), current medication list Time: First appointment approximately 20–30 minutes

7. Treatment — Antivirals, Pain Management, and Nerve Blocks

Antiviral Therapy — Insurance covered; start within 72 hours

• Valacyclovir (1,000 mg × 3/day × 7 days): The most commonly prescribed oral agent in Japan; high bioavailability

• Acyclovir (800 mg × 5/day × 7 days): Well-established efficacy

• Famciclovir (500 mg × 3/day × 7 days)

• Intravenous antivirals: reserved for severe, disseminated, or immunocompromised cases — we coordinate inpatient referral as needed

Pain Management — Insurance covered

• Acute phase: NSAIDs (loxoprofen, celecoxib), acetaminophen

• Neuropathic component: pregabalin, gabapentin — starting early in the acute phase may reduce PHN risk

• Tramadol / opioid analgesics for severe pain when standard agents are insufficient

Postherpetic Neuralgia (PHN) Management Dr. Suzuki's background in anesthesiology and pain medicine means we can offer comprehensive PHN management at our Pain Clinic (ペインクリニック内科):

• First-line: pregabalin (Lyrica®), gabapentin

• Adjunctive: tricyclic antidepressants (amitriptyline)

• Interventional: nerve blocks (epidural block, stellate ganglion block) — discussed at consultation

Topical Agents

• Zinc oxide ointment, fusidic acid ointment: secondary infection prevention during the vesicular phase

• Emollients for skin recovery after crusting

Ophthalmologic / ENT Complications Suspected ophthalmic zoster or Ramsay Hunt syndrome → immediate referral to ophthalmology or ENT, coordinated through our hospital network.

8. How Long Does Recovery Take?

With early antiviral treatment:

• Rash: vesicles crust within 7–10 days; full resolution in 3–4 weeks

• Acute pain: typically improves alongside the rash, but varies significantly

• PHN: by definition persists beyond one month post-rash — may last months to years in some patients; ongoing management required

Without treatment: viral replication continues longer, rash is more extensive, nerve damage is greater, and PHN risk is substantially higher. Every hour within the 72-hour window that passes without treatment represents additional nerve fiber damage that cannot be reversed by antivirals.

9. Everyday Care During and After a Shingles Episode

During the acute phase

• Rest and prioritize sleep: the body's immune recovery depends on it

• Shower gently with lukewarm water; avoid scrubbing the rash

• Do not break or scratch vesicles — this risks secondary bacterial infection and scarring

• Keep the rash covered; avoid close contact with people who lack VZV immunity (unvaccinated children, pregnant women, immunosuppressed individuals)

• Avoid alcohol during the acute phase

Nutrition

• Adequate protein, vitamins B12, C, and zinc to support nerve repair and immunity

• Balanced meals — no specific dietary restrictions, but avoid crash diets or fasting during the acute illness

Work and daily activity Desk work can often continue with physician guidance, but avoid overexertion. If you regularly walk through the area around Arisugawa-no-miya Memorial Park or Hiroo Promenade, gentle daily walks are fine once the acute pain is controlled — pushing through exhaustion is not.

10. Risks of Delayed Treatment — Postherpetic Neuralgia

Postherpetic Neuralgia (PHN) is the most significant complication of herpes zoster, defined as pain persisting more than one month after rash onset. Characteristics include:

• Allodynia (pain from non-painful stimuli like light touch or wind)

• Constant burning, aching, or stabbing

• Severe sleep disruption, anxiety, and depression

• Significant reduction in quality of life

PHN affects approximately 10–20% of all shingles patients; rates rise considerably in patients over 60 and in those whose antiviral treatment was delayed.

Ophthalmic complications (from ophthalmic zoster): corneal scarring, uveitis, glaucoma, vision impairment.

Ramsay Hunt syndrome: facial nerve palsy (drooping mouth, inability to close the eye), hearing loss, tinnitus, vertigo. Incomplete recovery of facial nerve function is common when treatment is delayed.

Secondary bacterial infection: Staphylococcal superinfection of vesicles can cause impetigo or cellulitis.

11. Who Is at Higher Risk?

• Adults over 50: Marked increase in both incidence and PHN risk

• Adults over 70: Particularly high PHN risk; vaccine discussion strongly advised

• People with diabetes, cancer, or autoimmune conditions: Higher severity and complication risk

• Patients on steroids, biologics, or chemotherapy: Immunosuppression dramatically increases reactivation risk

• Pregnant women: Antiviral selection requires medical judgment — please consult a physician

• Expats and international residents in Tokyo: Shingles can arise unexpectedly; having an English-speaking clinic familiar with managing this condition is important. We see and treat international patients regularly at our Hiroo clinic

12. When to See a Doctor — Checklist

Seek care promptly — ideally same day or within 24 hours — if any of the following apply:

• ☑ One-sided tingling, burning, or pain without an obvious cause

• ☑ A strip of red spots or blisters has appeared on one side of the body

• ☑ Symptoms involve the eye, forehead, nose tip, or ear

• ☑ You have facial weakness, difficulty closing one eye, or hearing changes

• ☑ You are within 72 hours of symptom onset

• ☑ You are over 50, have diabetes, or take immunosuppressive medication

• ☑ The rash is spreading rapidly or you have a high fever

The 72-hour window closes quickly. When in doubt, come in.

13. Prevention — Vaccines and Lifestyle

Herpes Zoster Vaccines Available in Japan

Recommendation: For adults aged 50 and over — particularly those aged 60 and above — the two-dose Shingrix regimen is generally preferred given its higher and more durable efficacy. We offer vaccine consultation at our clinic.

Lifestyle Prevention

• Prioritize sleep and stress management — the demands of working life in the Hiroo and Ebisu business corridor are real, but chronic sleep debt directly suppresses VZV-specific T-cell immunity

• Regular moderate exercise (walks in Shizen-kyoiku-en or around Hiroo Promenade) supports immune health without the immunosuppressive effects of overtraining

• Manage underlying conditions: well-controlled diabetes and autoimmune disease reduce reactivation risk

• Regular health checks: early detection of conditions that may require immunosuppressive treatment enables proactive vaccine planning

14. Dermatology & Pain Care at Yasashii Clinic Hiroo Shirokane

English-Friendly Care — From Diagnosis to Long-Term Pain Management

At Yasashii Clinic, we welcome international patients from Hiroo, Minami-Azabu, Shirokane, and surrounding neighborhoods. English consultations are available. We regularly manage shingles cases in foreign residents, including diagnosis, antiviral prescription, PHN monitoring, and vaccine counseling — all in English.

We accept Japanese national health insurance and self-pay. For those on international insurance plans, we can provide the documentation needed for reimbursement.

Dr. Suzuki's Dual Expertise: Dermatology and Pain Medicine

Dr. Takafumi Suzuki brings a rare combination of skills to shingles management: clinical dermatology experience alongside specialist-level expertise in pain medicine (anesthesiology, perioperative care, and pain clinic). This means we are equipped not only to diagnose and prescribe antivirals in the acute phase, but also to manage the neuropathic pain of PHN — from pharmacological optimization to discussing interventional options such as nerve blocks.

"Shingles pain can be genuinely debilitating. We want patients to know that there are effective options for PHN, and that the earlier we start, the better the outcome tends to be."

Referral Network

Ophthalmic zoster → ophthalmology referral Ramsay Hunt syndrome → ENT referral Severe/disseminated zoster requiring hospitalization → Tokyo Metropolitan Hiroo Hospital, Japanese Red Cross Medical Center, Kitasato University Kitasato Institute Hospital, or The Institute of Medical Science Hospital (University of Tokyo)

Access & Hours

• 5 min walk from Hiroo Station (Tokyo Metro Hibiya Line, Exit 2)

• 10 min walk from Ebisu Station (JR / Tokyo Metro)

• 13 min walk from Shirokanedai and Shirokane-Takanawa Stations

• Parking available

Opening Hours: Monday: 16:00–20:00 | Wednesday & Thursday: 10:00–14:00 / 16:00–20:00 Saturday & Sunday: 10:00–18:00 | Public Holidays: 10:00–14:00 Closed: Tuesday, Friday Please check the official website or call for the most up-to-date schedule.

Services

• English consultations available

• Credit cards accepted

• Online consultations (follow-up and PHN monitoring)

• LINE Official Account for 24/7 booking

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15. Summary

• Herpes zoster (shingles) is caused by reactivation of the chickenpox virus (VZV) and produces characteristic one-sided nerve pain followed by a dermatomal blistering rash

• Antiviral treatment started within 72 hours of onset is the most effective way to reduce severity and prevent postherpetic neuralgia (PHN)

• Ophthalmic zoster and Ramsay Hunt syndrome require same-day medical attention

• PHN is a serious and sometimes long-lasting complication — pain medicine expertise at our clinic means we can support you through both the acute and chronic phases

• Adults aged 50 and over should discuss shingles vaccination (particularly Shingrix) with their physician

English FAQ

Q1. What causes shingles? Shingles is caused by reactivation of the varicella-zoster virus (VZV), which lies dormant in sensory nerve ganglia following a past chickenpox infection. Reactivation is triggered by immune decline due to aging, stress, illness, or medication.

Q2. Can shingles spread to other people? The shingles rash itself is not contagious in the sense of spreading shingles to others. However, someone who has never had chickenpox (or the vaccine) can catch chickenpox from direct contact with active shingles vesicles. Once the rash is fully crusted, it is no longer contagious.

Q3. How long does shingles last? The rash typically resolves within 3–4 weeks. Acute pain usually improves alongside the rash, though some patients experience prolonged nerve pain (PHN) for months or longer. Early antiviral treatment shortens the active disease course and reduces PHN risk.

Q4. Do I need to see a doctor, or can I manage it at home? You need to see a doctor. Prescription antiviral medication is required to treat the underlying virus — OTC products cannot. The 72-hour treatment window is a real and significant threshold. Please seek medical care promptly.

Q5. When is it an emergency? Treat as urgent (same day) if: symptoms affect the eye, forehead, or nose tip; you have facial weakness, hearing loss, or ear vesicles; or you are severely immunocompromised. These presentations carry a risk of serious, potentially permanent complications.

Q6. What is postherpetic neuralgia (PHN) and how is it treated? PHN is chronic nerve pain persisting more than one month after the shingles rash heals. It affects roughly 10–20% of shingles patients — more in older adults. Treatment includes gabapentinoids (pregabalin, gabapentin), tricyclic antidepressants, topical lidocaine patches, and in refractory cases, nerve blocks. At our clinic, Dr. Suzuki's pain medicine expertise means PHN management is a core strength.

Q7. Who should get the shingles vaccine? Adults aged 50 and over are recommended to consider vaccination. The two-dose Shingrix (recombinant zoster vaccine) offers approximately 90% protection against shingles and PHN. It is safe for immunocompromised individuals. The single-dose live vaccine is an option for those who prefer a simpler regimen. We offer vaccine consultation at our clinic.

Q8. Do you see foreign patients? Is English available? Yes — we regularly see expats, foreign residents, and international patients from the Hiroo, Minami-Azabu, Shirokane, and Ebisu areas. English consultations are available. Book via LINE at https://line.me/R/ti/p/@744yxkjg or call +81-3-6456-4990.

Q9. Is treatment covered by Japanese health insurance? Yes. Antiviral prescriptions and pain management treatment are covered under Japanese national health insurance. Shingles vaccination is self-pay. Some municipalities offer subsidy programs for the shingles vaccine — please inquire for details.

Q10. Can I have an online consultation for shingles? For follow-up appointments and PHN monitoring, online consultation is available. For first visits and acute presentations (especially within the 72-hour window), an in-person visit is strongly recommended so the rash can be directly assessed and prescription issued promptly.