Dermatologic Diagnosis: Leukocytoclastic Vasculitis.

Leukocytoclastic vasculitis (LCV), also termed hypersensitivity vasculitis, is a small-vessel vasculitis. The skin is the organ most commonly involved in LCV. Typical presentation is a painful, burning rash predominantly in the lower extremities. The most common skin manifestation is palpable purpura. Other skin manifestations include maculopapular rash, bullae, papules, plaques, nodules, ulcers, and livedo reticularis.