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. Vasculitis means inflammation of the blood vessels, arteries, veins or capillaries. When such inflammation occurs, it causes changes in the walls of blood vessels, such as weakening and narrowing that can progress to the point of blood vessel blockage.asculitis. Vasculitis means inflammation of the blood vessels, arteries, veins or capillaries. When such inflammation occurs, it causes changes in the walls of blood vessels, such as weakening and narrowing that can progress to the point of blood vessel blockage.