Purpuric dermatitis

Pigmented purpuric dermatosis is a group of chronic dermatoses with purpuric papules and hemosiderin-containing deposits. Pigmented purpuric lichenoid dermatitis is common in middle-aged and elderly people, with more men than women. Skin lesions are small rust-colored lichen-like pimples accompanied by purpura-like lesions, which are purplish red or purplish-brown. They can fuse into unclear patches with a few scales on the surface and petechiae on the edges. It develops upwards to the thighs, buttocks, waist, and upper limbs, often with varying degrees of itching. The course of the disease is chronic and can last for months to years.