Penicillamine-associated pemphigus: is it really pemphigus?

Area of Science:

• Dermatology
• Immunodermatology

Background:

• Penicillamine-associated bullous eruptions share features with pemphigus, including intraepidermal acantholysis and intercellular immunoglobulin deposition.
• Spontaneous pemphigus involves autoantibodies targeting epidermal intercellular regions.

Observation:

• A case of penicillamine-associated bullous eruption presented with some pemphigus-like histology.
• However, immunofluorescence revealed findings consistent with bullous pemphigoid, not pemphigus.

Findings:

• Histological and immunofluorescence data suggest penicillamine-associated bullous eruptions may be immunologically distinct from spontaneous pemphigus.
• Clinical and histological differences between these conditions are noted in the literature.

Implications:

• This case contributes immunologic evidence supporting the classification of penicillamine-associated bullous eruptions as a separate entity from pemphigus.
• Further research into the immunopathogenesis of drug-induced blistering diseases is warranted.