Ramsay Hunt Syndrome (Herpes Zoster Oticus)

A facial palsy with painful blisters on the ear is Ramsay Hunt syndrome until proven otherwise. It is a peripheral facial nerve palsy accompanied by an erythematous vesicular rash on the ear or in the mouth, caused by reactivation of the varicella-zoster virus (VZV) in the geniculate ganglion. That reactivation is why it also carries the name herpes zoster oticus.

It punches above its rarity for two reasons. Compared with Bell’s palsy, the paralysis is often more severe at onset and less likely to recover completely. And early on it can look exactly like Bell’s palsy, because the rash sometimes appears only after the weakness begins, or never appears at all. Both facts pull in the same direction: recognise it early, and treat it early.

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Aetiology and pathophysiology

The causative agent is varicella-zoster virus, reactivating from latency within the nerve. As in Bell’s palsy, the injury is inflammatory: inflammation, oedema, and compression of the facial nerve within the bony fallopian canal. The distinction is the virus — Ramsay Hunt is VZV, whereas Bell’s palsy is attributed to reactivation of latent herpes simplex virus type 1 (HSV-1).

Why the eighth nerve gets involved. Ramsay Hunt syndrome frequently drags in the vestibulocochlear nerve (CN VIII) — producing hearing loss, tinnitus, and vertigo alongside the facial palsy. J. Ramsay Hunt himself explained this by the close anatomical proximity of the geniculate ganglion to the vestibulocochlear nerve within the bony facial canal: inflammation at the geniculate ganglion readily spreads to the adjacent eighth nerve. (VZV reactivation is itself a proposed cause of vestibular neuritis and labyrinthitis.)

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Clinical presentation

The classic constellation is a triad:

1. Ipsilateral lower motor neuron facial palsy — often more severe at onset than in Bell’s palsy.
2. Severe otalgia — ear pain, frequently intense and preceding the other features.
3. A vesicular rash — erythematous vesicles on the ipsilateral ear and face (and, by the strict definition, the ear or the mouth). Vesicular lesions are reported in up to 80% of patients.

The timing trap. The rash is not always there when the palsy appears. In the only prospective study cited in the literature, 14% of patients developed vesicles after the onset of facial weakness — so early in its course, Ramsay Hunt syndrome may look exactly like Bell’s palsy until the rash declares itself. This is a core reason not to anchor prematurely on “Bell’s palsy” and to re-examine the ear.

Eighth-nerve and related features. Beyond the triad, patients may have hearing loss, tinnitus, vertigo, nausea, vomiting, and nystagmus — reflecting spread to the vestibulocochlear nerve.

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Zoster sine herpete — Ramsay Hunt without the rash

Some patients develop peripheral facial paralysis with no ear or mouth rash at all, yet have evidence of VZV: a fourfold rise in antibody to VZV, or the presence of VZV DNA in auricular skin, blood mononuclear cells, middle-ear fluid, or saliva. This is zoster sine herpete — and it means that a proportion of patients labelled “Bell’s palsy” in fact have Ramsay Hunt syndrome without the tell-tale vesicles. It matters because these patients benefit from the same antiviral-plus-steroid treatment when it is started early.

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Ramsay Hunt syndrome vs Bell’s palsy

They are the two commonest causes of atraumatic lower motor neuron facial palsy, and the top differential for one another.

Feature	Ramsay Hunt syndrome	Bell’s palsy
Virus	Varicella-zoster (VZV)	Herpes simplex type 1 (HSV-1)
Vesicular rash	Present (ear/mouth) — but may follow the palsy or be absent (sine herpete)	Absent
Otalgia	Often severe	Post-auricular ache; usually milder
Eighth-nerve features (hearing loss, vertigo, tinnitus)	Common	Uncommon
Severity at onset	Often more severe	Variable
Complete recovery	Less likely	More likely

The single most useful discriminator is the vesicular rash plus severe otalgia — but because the rash can appear late or never, the two conditions overlap early, which is exactly why zoster sine herpete must be kept in mind.

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Diagnosis

Ramsay Hunt syndrome is primarily a clinical diagnosis — facial palsy with severe otalgia and the characteristic vesicular rash. Where the diagnosis is in doubt (particularly suspected zoster sine herpete), VZV can be confirmed by a fourfold rise in VZV antibody, or by detecting VZV DNA in auricular skin, blood mononuclear cells, middle-ear fluid, or saliva.

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Management

The governing principle is that treatment works best when it is early — the window, not the drug, is what most affects outcome.

• Antiviral therapy. Add an antiviral once herpes zoster oticus is suspected. Regimens described in the literature are a 7–10 day course of famciclovir 500 mg three times daily or aciclovir 800 mg five times daily; valaciclovir is also used. Antiviral therapy should always be given to immunocompromised patients with herpes zoster oticus.
• Corticosteroids. Used in combination with the antiviral — oral prednisone 60 mg daily for 3–5 days is one described regimen. (A prospective randomised trial of treatment in Ramsay Hunt syndrome has never been done, so the evidence is weaker than for Bell’s palsy — but combination steroid-plus-antiviral is the standard of care.)
• Eye protection. As with any facial palsy that leaves the eye unable to close: ophthalmic lubricants during the day, ointment at night, and eye patching or a moisture chamber during sleep, to protect the exposed cornea.

Ramsay Hunt syndrome is a treatment-timing–sensitive diagnosis; specific regimens are for the treating clinician. This page summarises published guidance and is not a substitute for it.

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Prognosis

The outlook is worse than Bell’s palsy, with more severe paralysis at onset and a lower chance of complete recovery, which is precisely why early treatment matters so much. The timing effect is stark: in a retrospective series of 80 patients treated with aciclovir and prednisone, complete recovery of facial function occurred in 75% (21/28) when treatment began within 3 days of onset, but in only 30% (7/23) when it began more than 7 days after onset. Early treatment also reduced nerve degeneration on excitability testing, and hearing recovery tended to be better. Facial function is tracked over time on the House–Brackmann scale.

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Frequently Asked Questions

What is the difference between Ramsay Hunt syndrome and Bell’s palsy? Both are lower motor neuron facial palsies, but Ramsay Hunt syndrome is caused by varicella-zoster virus and comes with a vesicular rash on the ear or mouth, severe ear pain, and often eighth-nerve features (hearing loss, vertigo, tinnitus). Bell’s palsy is attributed to herpes simplex type 1, has no rash, and generally causes milder disease with a better chance of full recovery. The catch is that the Ramsay Hunt rash can appear after the weakness — or not at all (zoster sine herpete) — so the two can look identical early on.

Why does Ramsay Hunt syndrome cause hearing loss and vertigo when Bell’s palsy usually doesn’t? Because the geniculate ganglion of the facial nerve sits very close to the vestibulocochlear nerve (CN VIII) within the bony facial canal. Inflammation of the geniculate ganglion in Ramsay Hunt syndrome readily spreads to the adjacent eighth nerve, producing hearing loss, tinnitus, vertigo, and nausea.

Can you have Ramsay Hunt syndrome without a rash? Yes — this is called zoster sine herpete. The patient has a facial palsy with no ear or mouth vesicles, but VZV can be confirmed by a rising antibody titre or by detecting VZV DNA in auricular skin, blood, middle-ear fluid, or saliva. A proportion of apparent “Bell’s palsy” is actually Ramsay Hunt syndrome without the rash.

Why does treatment timing matter so much? Because the outcome depends heavily on how early antiviral-plus-steroid therapy is started. In one series, complete recovery occurred in about 75% of patients treated within 3 days of onset, versus only about 30% of those treated after 7 days. The virus and the resulting nerve damage progress, so delay costs recovery.

Is Ramsay Hunt syndrome more serious than Bell’s palsy? Generally yes. The facial paralysis tends to be more severe at onset, the eighth nerve is more often involved, and complete recovery is less likely — which is why prompt recognition and early treatment are emphasised.