Urinary tract infection (UTI) facts. 1  Urinary tract infections (UTIs) are infections of the urethra, bladder, ureters, or the kidneys, which comprise the urinary tract.  E. coli bacteria cause the majority of UTIs, but many other bacteria, fungi, and parasites may also cause UTIs.
Common vasculitis skin lesions are: 1  red or purple dots (petechiae), usually most numerous on the legs. 2  larger spots, about the size of the end of a finger (purpura), some of which look like large bruises. 3  Less common vasculitis lesions are hives, an itchy lumpy rash and painful or tender lumps. Antibodies that react against cells in vessel walls. 2  In some cases of vasculitis, an antibody against the cytoplasm of neutrophils (anti-neutrophil cytoplasm antibodies, or ANCA) is the probable cause of the inflammation and damage.
Vasculitis is blood vessel inflammation that causes fever, pain, local tenderness and other evidence of blocked blood vessels. When a blood vessel becomes inflamed and narrowed, blood supply to that area can become partially or completely blocked, cutting off blood supply to the tissues beyond. Inflammation causes the vessel wall to swell. This makes blood stick to the inner wall to form a clot. When vasculitis interferes with circulation in any part of the body, it causes local tenderness and pain. If the blood vessels are close to the skin, characteristic rashes occur. Depending on where the blockage occurs, almost any organ in the body can be affected. (Note: Vasculopathy can also block blood vessels, but it does not cause the fever, pain and local tenderness associated with vasculitis. It may, however, cause pain if the parts that are no longer receiving a blood supply die â a circumstance called infarction.)