Erythema multiforme-like eruptions associated with etretinate therapy.

Area of Science:

• Dermatology
• Pharmacology

Background:

• Etretinate is a retinoid medication used for various skin conditions.
• Mucocutaneous side effects are common and typically dose-dependent.
• Hypersensitivity drug eruptions are considered rare.

Observation:

• Two patients developed erythema multiforme-like skin eruptions after initiating oral etretinate therapy.
• The eruptions appeared several days following the commencement of etretinate treatment.
• In one patient, re-administration of etretinate led to a recurrence of the skin eruption, suggesting a hypersensitivity reaction.

Findings:

• This case series highlights that erythema multiforme-like eruptions can be a rare, yet significant, adverse reaction to etretinate.
• The findings suggest a potential hypersensitivity mechanism rather than a typical dose-dependent effect for these specific eruptions.
• Etretinate rechallenge confirmed the causal link in one patient.

Implications:

• Clinicians should be aware of the possibility of rare hypersensitivity reactions, including erythema multiforme-like eruptions, with etretinate use.
• Prompt recognition and discontinuation of etretinate may be necessary to manage these adverse events.
• Further investigation into the mechanisms of rare etretinate-induced hypersensitivity is warranted.