Bullous lichen planus - a review

Area of Science:

• Dermatology
• Pathology

Background:

• Bullous lichen planus (BLP) is an uncommon variant of lichen planus.
• It is characterized by the development of vesicles or bullae on pre-existing lichen planus lesions.
• BLP is frequently misdiagnosed and requires differentiation from other subepidermal bullous diseases, notably lichen planus pemphigoides.

Purpose of the Study:

• To elucidate the diagnostic criteria and histopathological features of bullous lichen planus.
• To differentiate bullous lichen planus from other blistering disorders.
• To discuss potential therapeutic options for bullous lichen planus.

Main Methods:

• Diagnosis relies on clinical suspicion confirmed by histopathology and direct immunofluorescence.
• Histopathological examination reveals alterations at the dermo-epidermal junction and intrabasal bullae.
• Immunofluorescence studies are crucial for differential diagnosis.

Main Results:

• Clinical presentation includes typical lichen planus lesions with superimposed bullae.
• Histology shows dermo-epidermal junction changes and intrabasal bullae due to inflammation.
• Negative immunofluorescence results support the classification of BLP as a hyper-reactive form of lichen planus.

Conclusions:

• Bullous lichen planus is considered a hyper-reactive variant of lichen planus rather than a distinct entity.
• Accurate diagnosis involves clinical assessment, histopathology, and immunofluorescence.
• Treatment options include topical/systemic corticosteroids, dapsone, and acitretin, though no standard protocol exists.