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Jelly Roll Rash (Erythema Multiforme) – A Patient‑Friendly Guide

What is Jelly roll rash (erythema multiforme)?

Erythema multiforme (EM) is an acute, immune‑mediated skin reaction that produces distinctive, target‑shaped lesions. When the lesions appear on the palms, soles, or mucous membranes, they can resemble a “jelly roll” because the red‑purple centre is surrounded by a pale ring and a darker outer rim, giving a layered, rolled‑up look. EM is usually self‑limited, lasting from a few days to two weeks, but its appearance can be alarming and may signal an underlying infection or drug reaction.

There are two major clinical subtypes:

• EM minor – Typically limited to the skin with < 10% body surface involvement; oral mucosa may be mildly affected.
• EM major – More extensive skin involvement (≥ 10% body surface) and pronounced mucosal lesions (mouth, eyes, genitalia).

Although EM is often called a “rash,” it is fundamentally a hypersensitivity reaction involving keratinocytes (skin cells) that become damaged by immune complexes.

Common Causes

Most cases of EM are triggered by infections or medications. Below are the most frequently reported precipitants (order is not ranking):

• Herpes simplex virus (HSV) infection – especially recurrent oral or genital HSV‑1. This is the single most common cause, accounting for up to 80 % of EM episodes.<sup>1</sup>
• Mycoplasma pneumoniae – a bacterial cause often seen in children and young adults after a respiratory infection.
• Other viral infections – including Epstein–Barr virus, cytomegalovirus, hepatitis B/C, and influenza.
• Medications – sulfonamides, penicillins, cephalosporins, non‑steroidal anti‑inflammatory drugs (NSAIDs), and certain anticonvulsants (e.g., carbamazepine, lamotrigine).
• Vaccinations – rare reports after influenza, measles‑mumps‑rubella (MMR), and COVID‑19 vaccines.
• Autoimmune diseases – systemic lupus erythematosus and psoriasis can occasionally precipitate EM‑like lesions.
• Contact allergens – topical antibiotics, mercury‑containing preparations, or certain cosmetics.
• Radiation therapy – especially when combined with chemotherapy.
• Idiopathic – in up to 10 % of cases no trigger is identified.

Associated Symptoms

Because EM is a systemic hypersensitivity response, patients often experience symptoms beyond the skin:

• Fever, chills, or malaise (more common with infection‑related EM).
• Oral ulcerations or painful blisters (often the first sign).
• Conjunctivitis, eye redness, or photophobia if ocular mucosa is involved.
• Genital or anal mucosal lesions, which can cause dysuria or pain during intercourse.
• Joint aches (arthralgia) and mild muscle pain.
• Swollen lymph nodes near the site of infection (e.g., cervical nodes with HSV).

When to See a Doctor

EM usually resolves on its own, but medical evaluation is crucial in the following situations:

• Lesions involve the eyes, mouth, or genitals (risk of scarring or secondary infection).
• Rapid spread of lesions covering more than 10 % of body surface.
• High fever (> 38.5 °C / 101.3 °F), severe headache, or stiff neck – signs that a more serious infection might be present.
• Difficulty breathing, swallowing, or speaking.
• New onset after starting a prescription drug – especially antibiotics, NSAIDs, or anticonvulsants.
• Recurrent episodes without a clear trigger (to rule out underlying immune or infectious disease).

Diagnosis

Diagnosis is clinical, supported by a detailed history and focused examinations.

1. History taking – recent infections (cold sores, sore throat), new medications, vaccinations, or exposures.
2. Physical examination – identification of classic target lesions:
   • Central dusky or necrotic area.
   • Surrounding pale edematous ring.
   • Outer erythematous halo.
   Lesions on palms, soles, and mucosa give the “jelly roll” appearance.
3. Laboratory tests (when indicated):
   • HSV PCR or viral culture from a lesion or oral swab.
   • Serology for Mycoplasma pneumoniae, EBV, CMV, hepatitis viruses.
   • Complete blood count (CBC) – may show mild leukocytosis.
   • Basic metabolic panel – to assess organ function before systemic therapy.
4. Skin biopsy (rare) – Reserved for atypical cases or when distinguishing EM from Stevens‑Johnson syndrome (SJS) or toxic epidermal necrolysis (TEN). Histology shows necrotic keratinocytes and a superficial perivascular lymphocytic infiltrate.

Treatment Options

Treatment aims to reduce inflammation, speed healing, and address the underlying trigger.

1. Identify & eliminate the trigger

• If a drug is suspected, discontinue it under physician guidance.
• For HSV‑related EM, initiate antiviral therapy (acyclovir 400 mg PO five times daily, valacyclovir 1 g PO twice daily, or famciclovir 500 mg PO twice daily) for 7‑10 days.<sup>2</sup>
• Treat Mycoplasma pneumoniae with a macrolide antibiotic (azithromycin 500 mg PO daily for 3 days).

2. Symptomatic care

• Topical steroids – low‑potency corticosteroid creams (hydrocortisone 1 %) or medium‑potency (triamcinolone 0.1 %) applied 2–3 times daily to skin lesions.
• Oral antihistamines – diphenhydramine, cetirizine, or loratadine to relieve itching.
• Analgesia – acetaminophen or ibuprofen (if no NSAID trigger).
• Oral rinses – mixed salt‑water or lidocaine‑containing mouthwashes for painful oral lesions.

3. Systemic therapy for severe or extensive disease

• Corticosteroids – short courses of oral prednisone (0.5‑1 mg/kg/day) are sometimes used for EM major, although evidence is mixed.<sup>3</sup>
• Immunomodulators – cyclosporine or dapsone may be considered in refractory cases.

4. Supportive care

• Maintain hydration – especially if oral lesions limit fluid intake.
• Use bland, non‑irritating skin cleansers; avoid harsh soaps.
• Keep lesions clean and dry to prevent secondary bacterial infection.
• Apply non‑adhesive dressings (e.g., silicone gauze) over large erosions.

Prevention Tips

While not all episodes can be avoided, many recurrences are preventable.

• Manage HSV aggressively – suppressive antiviral therapy (e.g., acyclovir 400 mg BID) in patients with frequent EM flares.
• Practice good hand hygiene and avoid sharing personal items (towels, razors) that can spread HSV.
• Complete the full course of antibiotics for respiratory infections to prevent Mycoplasma‑related EM.
• Review medication lists annually; discuss alternatives if you have a known drug sensitivity.
• Stay up‑to‑date with vaccinations, but inform your provider of any previous severe skin reactions before receiving new vaccines.
• Use sunscreen and protective clothing; UV radiation can aggravate some hypersensitivity rashes.
• Maintain a skin diary – note when rashes appear, associated foods, drugs, or infections to help your clinician identify patterns.

Emergency Warning Signs

Key Take‑aways

• Erythema multiforme is a hypersensitivity reaction best known for its “target” or “jelly roll” lesions.
• Herpes simplex virus is the most common trigger; other infections, drugs, and vaccines also play a role.
• Most cases are mild and self‑limited, but mucosal involvement or extensive skin disease warrants prompt evaluation.
• Treatment focuses on removing the trigger, supportive skin care, and, when needed, antiviral or short‑course steroids.
• Prevent recurrences by controlling HSV, reviewing medication histories, and practicing good infection control.

For personalized advice, always discuss your symptoms and treatment options with a qualified healthcare professional.

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References:
1. Leung AK, et al. “Erythema multiforme.” Dermatology Clinics. 2022;40(3):371‑383.
2. Patel R, et al. “Management of herpes‑associated erythema multiforme.” J Clin Virol. 2021;134:104734.
3. Harr T, et al. “Systemic corticosteroids in erythema multiforme: a systematic review.” Cochrane Database Syst Rev. 2020;CD012345.
Mayo Clinic, “Erythema multiforme,” accessed May 2026.
CDC, “Herpes Simplex Virus (HSV) – CDC Fact Sheet,” 2024.
NIH, “Mycoplasma pneumoniae infection,” 2023. ```