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Persistent rash on the sole

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Diagnosis:

Herpes zoster

Histopathologic examination showed full-thickness epidermal necrosis with ballooning degeneration resulting in an intra-epidermal blister. Multinucleated keratinocytes with nuclear moulding were seen within the blister cavity. Grocott-Gomori methenamine-silver (GMS), acid-fast, and Gram stains were negative. Granular immunoglobulin (Ig) G, IgM, and C3 were seen intramurally. DNA analysis of vesicular fluid was positive for varicella zoster virus (VZV). A diagnosis of herpes zoster (HZ) of the right S1 dermatome with primary obliterative vasculitis was established.

Immunocompromised people—those who have impaired T-cell immunity (eg, recipients of organ or hematopoietic stem-cell transplants), take immunosuppressive therapy, or have lymphoma, leukemia, or human immunodeficiency virus (HIV) infection—have an increased risk for HZ. For example, in patients with acquired immunodeficiency syndrome (AIDS), HZ uniquely manifests as recurrent shingles. An estimated 20% to 30% of HIV-infected patients will have more than 1 episode of HZ, which may involve the same or different dermatomes.1,2 Furthermore, HZ in this population is more commonly associated with atypical presentations.3

What an atypical presentation may look like

In immunocompromised patients, HZ may present with atypical cutaneous manifestations or with atypical generalized symptoms.

Atypical cutaneous manifestations, as in disseminated zoster, manifest with multiple hyperkeratotic papules (3-20 mm in diameter) that follow no dermatomal pattern. These lesions may be chronic, persisting for months or years, and may be associated with acyclovir-resistant strains of VZV.2,3 Another dermatologic variant is ecthymatous VZV, which manifests with multiple large (10-30 mm) punched-out ulcerations with a central black eschar and a peripheral rim of vesicles.4 Viral folliculitis—in which infection is limited to the hair follicle, with no associated blisters—has also been reported in atypical HZ.5

It’s been proposed that in atypical presentations, the reactivated VZV spreads from adjacent nerves to the outermost layer of the arterial wall, giving lesions a vasculitic appearance.

Our patient presented with hemorrhagic vesicles mimicking vasculitic lesions, which had persisted over a 3-month period with intermittent localized pain. It has been proposed that in atypical presentations, the reactivated VZV spreads transaxonally from adjacent nerves to the outermost adventitial layer of the arterial wall, leading to a vasculitic appearance of the vesicles.6 Viral-induced vasculitis may also result either directly from infection of the blood vessels or secondary to vascular damage from an inflammatory immune ­complex–mediated reaction, cell-­mediated hypersensitivity, or inflammation due to immune dysregulation.7,8

Continue to: Differential includes vesiculobullous conditions

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