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Bullous pemphigoid induced by cephalexin
R T Czechowicz1, C M Reid, L J Warren
1Department of Dermatology, Royal Adelaide Hospital, South Australia, Australia. rtczech@hotmail.com
The Australasian Journal of Dermatology
|April 20, 2001
Summary
Two young men developed severe bullous pemphigoid after taking cephalexin. This study reports the first cases of cephalexin-induced bullous pemphigoid, a rare drug reaction.
Area of Science:
- Dermatology
- Immunodermatology
- Pharmacology
Background:
- Drug-induced bullous eruptions are uncommon but can mimic autoimmune blistering diseases.
- Cephalexin is a widely used antibiotic with a known, albeit rare, side effect profile.
Observation:
- Two young male patients presented with severe bullous dermatosis characterized by flexural lesions and mucosal ulcerations.
- Histopathology revealed subepidermal blisters with prominent neutrophilic infiltrate.
- Direct immunofluorescence showed linear deposition of IgG and C3 at the dermal-epidermal junction.
Findings:
- Clinical, histopathological, and immunofluorescence findings were consistent with bullous pemphigoid.
- Both patients had recently taken cephalexin prior to the onset of symptoms.
- This suggests a potential causal link between cephalexin and the development of bullous pemphigoid.
Implications:
- These cases represent the first documented instances of cephalexin-induced bullous pemphigoid.
- Physicians should consider cephalexin as a potential trigger for bullous pemphigoid in susceptible individuals.
- Further research is warranted to elucidate the mechanisms underlying this drug-induced autoimmune response.