A case of diffuse Gougerot and Blum purpuric pigmented dermatosis.

Purpuric and pigmented lichenoid dermatitis of Gougerot and Blum is a form of purpuric pigmented dermatosis. These entities are rarely described, but are likely underdiagnosed. Herein, we present a patient with this condition that is unusual in is its diffuse nature and its delayed diagnosis after twenty years of evolution.