Lymphocytic vasculitis is one of several skin conditions which are collectively referred to as cutaneous vasculitis. In lymphocytic vasculitis, white blood cells (lymphocytes) cause damage to blood vessels in the skin. This condition is thought to be caused by a number of factors, but the exact cause of most cases is not known. This disease can present with a variety of symptoms, depending on the size, location, and severity of the affected area. In a minority of patients, cutaneous vasculitis can be part of a more severe vasculitis affecting other organs in the body - this is known as systemic vasculitis.

Lymphocytic vasculitis is thought to be caused by a number of different factors, such as infection, trauma, drug reaction, or an underlying condition such as arthritis. Because this condition is rare and not yet well understood, it is believed that a full list of possible causes has yet to be assembled.

The prognosis of lymphocytic vasculitis depends on the extent and severity of the disease. In most cases, lymphocytic vasculitis affects only the skin and may be a mild, benign condition that eventually heals. One study found that the skin findings lasted an average of two and a half years. However, a minority of individuals with this condition may progress to systemic vasculitis such that the damage to the blood vessels affects internal organs. This suggests a less favorable outlook that could result in a chronic, debilitating condition; the severity of systemic vasculitis depends on which organs are affected.