Urticarial vasculitis. Close-up of a rash on the chest of a 63-year-old male patient with urticarial vasculitis. Urticaria, also known as nettle rash or hives, is a skin condition in which a rash of itchy wheals or lumps develops on the skin, usually on the trunk or limbs. Urticarial vasculitis is a rare autoimmune disease characterised by fixed urticarial lesions that appear as vasculitis (inflamed blood vessels).
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