Bullous pemphigoid and prurigo nodularis

Area of Science:

• Dermatology
• Immunodermatology

Background:

• Bullous pemphigoid is a chronic autoimmune blistering disease.
• Pemphigoid nodularis is a variant that can mimic or evolve from prurigo nodularis.
• The relationship between prurigo nodularis and bullous pemphigoid is not well-established.

Observation:

• A patient presented with prurigo nodularis without immunologic evidence of pemphigoid.
• The same patient later developed blisters.
• Direct immunofluorescence confirmed bullous pemphigoid after blister formation.

Findings:

• This case suggests prurigo nodularis may precede the development of bullous pemphigoid.
• The findings indicate a potential temporal and possibly causal relationship between these conditions.

Implications:

• Further research is needed to understand the link between prurigo nodularis and bullous pemphigoid.
• Clinicians should consider bullous pemphigoid in patients with prurigo nodularis who develop blisters.