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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