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Updated: Jul 18, 2026

Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response
Published on: October 3, 2019
Erythema multiforme
Michele R Lamoreux1, Marna R Sternbach, W Teresa Hsu
1Drexel University College of Medicine, Philadelphia, Pennsylvania 19127, USA. mlamoreu@drexelmed.edu
Abstract:
Erythema multiforme is a skin condition considered to be a hypersensitivity reaction to infections or drugs. It consists of a polymorphous eruption of macules, papules, and characteristic "target" lesions that are symmetrically distributed with a propensity for the distal extremities. There is minimal mucosal involvement. Management involves treating the existing infectious agent or discontinuing the causal drug. Mild cases resolve without sequelae and do not require treatment. Recurrent cases have been prevented with continuous acyclovir. Patients who have no response to acyclovir may have a response to valacyclovir or famcilovir, which have greater oral bioavailability and more convenient dosing. Patients with recurrent erythema multiforme despite suppressive antiviral therapy should be referred to a dermatologist for further treatment.
Insights
Erythema multiforme is a hypersensitivity reaction causing characteristic target lesions. Antiviral therapy, including acyclovir, valacyclovir, or famciclovir, can prevent recurrent cases.
Area of Science:
- Dermatology
- Immunology
- Pharmacology
Background:
- Erythema multiforme is a skin condition presenting as a polymorphous eruption.
- It is recognized as a hypersensitivity reaction to infections or drugs.
- Lesions are typically symmetrical, featuring macules, papules, and characteristic target lesions, primarily on distal extremities.
Purpose of the Study:
- To summarize the clinical presentation and management of erythema multiforme.
- To discuss the role of antiviral therapy in managing recurrent cases.
Main Methods:
- Review of clinical presentation and diagnostic criteria for erythema multiforme.
- Analysis of treatment strategies, including addressing underlying causes and suppressional antiviral therapy.
Main Results:
- Mild cases of erythema multiforme often resolve without specific treatment.
- Continuous acyclovir has shown efficacy in preventing recurrent erythema multiforme.
- Valacyclovir and famciclovir offer alternatives with improved bioavailability and dosing convenience for non-responsive cases.
Conclusions:
- Management focuses on identifying and treating the causative agent or drug.
- Antiviral medications like acyclovir, valacyclovir, and famciclovir are crucial for managing recurrent erythema multiforme.
- Dermatological referral is recommended for persistent or treatment-refractory cases.
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