Pigmented Purpuric Dermatoses (Capillaritis) 
Schamberg's ...

Pigmented Purpuric Dermatoses (Capillaritis) 
Schamberg's Disease:
 - Chronic, benign, cutaneous eruptions characterized by petechiae, purpura, and increased skin pigmentation (brown, red, or yellow patchy)
 - Commonly seen in males and mainly affects the tibial regions, and could involve thighs, buttocks, trunk, or upper extremities
 - Extravasation of blood vessels particularly capillaries which allow red blood cells to get deposited into the skin which then releases their iron from hemoglobin.
 - This iron causes a rust color accounting for the orange or brown tint of the rash.
Eczematoid-like Purpura of Doucas and Kapetanakis:
 - Usually bilateral, intensely itchy, and characteristically has eczematous features.
 - Mild lichenification could be present and has a fluctuation course with spontaneous improvement occasionally
Majocchi Purpura:
 - Characterized by annular, purpuric lesions and erythematous punctate lesions, and central clearing with slight atrophy.
 - Most common site for involvement is the lower extremities
Gougerot-Blum Purpura:
 - Red-brown lichenoid papules that tend to fuse in plaques in older men.
Lichen Aureus:
 - Acute onset of distinctive, rust-yellow or gold colored lichenoid papules or circumscribed patches and plaques
 - Most frequently occurs unilaterally on the lower extremities; bilateral involvement is less common

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Contributed by

Dr. Ravi Singh K
Academic Hospitalist and APD @SinaiBmoreIMRes, Clinical reasoning,Simulation and POCUS enthusiast - https://twitter.com/rav7ks
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