Pigmented Purpuric Dermatoses (PPD) - Capillaritis Group of chronic, benign, cutaneous eruptions characterized by the presence of petechiae, purpura, and increased skin pigmentation most commonly occur on the lower extremities Schamberg 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 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 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 #PPD #Capillaritis #Pigmented #Purpuric #Dermatoses #Dermatosis #differential #diagnosis #dermatology
