The histopathology of RNs is defined by 3 stages: acute inflammation, granulation, and necrosis. The lesions develop from small areas of granulated tissue into large nodules with necrotic centers.

What is the differential diagnosis of a steroid-responsive illness manifested by severe headache, visual blurring, eye pain, fever, chills, night sweats, fatigue, septal panniculitis, and an elevated ...

Leukocytoclastic vasculitis is characterized by inflammation directed at small blood vessels in the skin. The process is mediated by neutrophils. Histologically, leukocytoclasis (i.e., destruction of ...

When vasculitis affects the skin, it can cause red or purple spots to develop. It may also cause ulcers or blisters. A vasculitis rash can become painful or itchy. Vasculitis is an inflammation and ...