Acrodermatitis continua of Hallopeau with dense infiltration of IgG4‐positive cells in the lesional dermis

Abstract

Acrodermatitis continua of Hallopeau (ACH) is a rare acropustular subtype of psoriasis. The characteristic feature of ACH is chronic, painful and destructive disease affecting the hands and feet, especially the fingertips and toes. The pathogenic mechanisms of ACH have not been fully elucidated. We report a case of ACH whose skin lesions showed dense infiltration of IgG₄‐positive cells in the dermis.

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