Erythema Multiforme
Erythema multiforme (EM) is an acute hypersensitivity reaction of the skin and mucous membranes, recognized by its classic target lesions. It usually comes on suddenly and is linked to a trigger, most often an infection (especially herpes simplex virus) or a reaction to a medication.
At Haute-Derma, we carefully distinguish the mild form (EM minor) from the severe form with mucosal involvement (EM major). Our first priority is to identify the trigger so we can prevent recurrences, while protecting the mucous membranes and easing the acute inflammatory symptoms.
Our Approach to Treating Erythema Multiforme
Our specialists recognize EM by its characteristic concentric lesions, which quickly set it apart from hives and other blistering diseases. We take a careful history of recent infections and medications to find the "key" that set off the immune reaction.
We understand that sores in the mouth or eyes in EM major can be painful and make eating and daily life difficult. At Haute-Derma, treatment combines antivirals (when herpes is the cause), immune modulation, and specialized local care to help patients recover quickly and minimize lasting marks on the skin.
Our erythema multiforme management plan includes:
- Screening for triggers (herpes simplex, Mycoplasma pneumoniae, or suspected medications).
- Preventive antiviral therapy for frequently recurring EM.
- Specialized mucosal care to prevent infection and scarring adhesions of the mucous membranes.
How We Diagnose Erythema Multiforme at Haute-Derma
To confirm the diagnosis and gauge severity, Haute-Derma follows a standard diagnostic process:
- Recognizing target lesions: Red papules with three distinct concentric zones: a center that may be blistered or dusky, a paler middle ring, and a bright red outer ring.
- Checking the distribution: Lesions typically appear symmetrically on the limbs (backs of the hands and feet, outer arms), palms, soles, and face.
- Assessing mucosal involvement: The mouth, eyes, and genitals are examined closely to identify EM major.
- Histopathology: In atypical cases, a skin biopsy looks for vacuolar degeneration of the basal layer and a lymphocytic infiltrate along the dermal papillae.
- Tests for the cause: Herpes simplex PCR, or testing for Mycoplasma if there are accompanying respiratory symptoms.
Specialized Treatment at Haute-Derma
Our protocol aims to remove the cause and calm the immune reaction:
- Treating the cause: Antivirals (acyclovir) when herpes is involved, or immediate withdrawal of any suspected drug.
- Topical or systemic corticosteroids: Used to reduce inflammation and shorten flares in EM major or widespread disease.
- Managing mucosal sores: Specialized numbing mouth rinses and protective mucosal gels from Haute-Derma make eating and drinking easier.
- Antihistamines: Help relieve itching or stinging in the skin lesions.
- Preventing recurrences: For patients with frequently recurring, herpes-related EM, Haute-Derma's specialists set up a low-dose antiviral regimen lasting 6 months to 1 year.
