Vasculitis.

The vasculitides are a large and diverse group of disorders, often confusing for the clinician in terms of diagnosis, investigation, and treatment. As most patients will have cutaneous lesions, it is useful for the physician to be aware of the dermatologic manifestations that may help in differentiating these diseases. This review covers both the common and not so common form of vasculitis, including both cutaneous and systemic disorders, an approach to investigation, and brief discussion of therapeutic approaches.