Bullous prurigo pigmentosa

Area of Science:

• Dermatology
• Pathology

Background:

• Prurigo pigmentosa (PP) is a rare inflammatory skin disease of unknown cause.
• It typically presents with recurrent, symmetrical, pruritic, erythematous papules leading to reticular hyperpigmentation, predominantly on the trunk and neck.
• PP is more frequently observed in Japan, with limited reports internationally.

Observation:

• This case report details a young Caucasian patient presenting with prurigo pigmentosa.
• The patient exhibited predominantly vesicular and bullous manifestations.
• These blistering lesions occurred superimposed on an existing maculopapular eruption on the trunk.

Findings:

• The case demonstrates a rare presentation of prurigo pigmentosa with significant vesicular and bullous features.
• This presentation is unusual given the rarity of such forms in existing literature.
• The differential diagnosis for this presentation includes several pigmentary and blistering dermatoses.

Implications:

• This case expands the known clinical spectrum of prurigo pigmentosa, particularly in non-Asian populations.
• It underscores the importance of considering prurigo pigmentosa in the differential diagnosis of blistering eruptions on the trunk.
• Further research into the etiology and diverse presentations of prurigo pigmentosa is warranted.