Highly variable. Angiitis is a very broad term meaning inflammation of blood vessels. It all depends which vessels are involved. Small blood vessels in the skin may be the only finding and cause a raised purple rash (usually on the legs) but larger vessels may also be involved and may effect almost any internal organ.
Which blood vessels. The symptoms of angiitis, which is inflammation of small blood vessels, depends on whihc blood vessels are inflammed. Blood vessels go all over the body and not all of then are inflammed. The characteristic of the blood vessels also show a pattern on biopsy. Some have granulomas and these can cause characteristic changes in the skin, lung, kidney, sinuses to name a few.