| Subject | Contents |
| Definition | Hypersensitivity to a drug or foreign agent leads to a skin disorder with inflammation and damage to blood vessels of the skin. |
| Alternative Names | Vasculitis; Vasculitis - allergic; Vasculitis - hypersensitivity |
| Causes, incidence, and risk factors | Vasculitis occurs because of inflammation and damage to blood vessels. The inflammation of allergic vasculitis is the result of an allergic reaction to a drug or other foreign agent. |
| Symptoms | skin lesions usually located on legs, buttocks, or trunk palpable (able to be felt with the fingers) purpura multiple papules (small, solid, raised skin areas) purpura ( bleeding into the skin )blisters on the skin urticaria ( hives ), may last longer than 24 hoursnecroticulcers (open sores with dead tissue) |
| Signs and tests | The diagnosis is primarily based on a history of skin lesions that develop after exposure to medications or a foreign substance ( antigen ) and the clinical presentation (pattern of symptoms). The ESR ( sed rate ) may be elevated.Skin biopsy shows vasculitis (inflammation of the blood vessels). This disease may also alter the results of a platelet aggregation test . |
| Treatment | Treatment is aimed at reducing the inflammation, allowing the natural healing process to occur. If possible, stop exposure to the causative medication (or other antigen ). Aspirin or corticosteroids may be prescribed to reduce inflammation of the blood vessels. (DO NOT give aspirin to children except as advised by the health care provider.) In severe cases, treatment with corticosteroids may be necessary. |
| Support Groups | |
| Expectations (prognosis) | Allergic vasculitis usually resolves in time. |
| Complications | permanent damage to the blood vessels or skin with scarring vasculitis affecting the internal organs (kidney, bone, and so on) |
| Calling your health care provider | Call for an appointment with your health care provider if symptoms indicate allergic vasculitis may be present. |
| Prevention | Avoid exposure to medications to which there are known allergies . |
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