Sjogren's And Vasculitis

I've noticed a few times that after standing relatively still for long periods of time (i.e. at a concert), the lower half of my legs is covered with a strange rash by the end of the evening. It's not itchy, not painful, but very visible. Of course, standing for long periods of time is painful on my joints, etc., but the rash itself isn't painful. With that though, my feet often feel strangely swollen and hot after lots of standing; that part is a little painful. I finally looked it up last night after it happening again and came upon something called "Vasculitis." I've made an appointment with a Rheumatologist to discuss further, but I'm curious to know if others have have experienced this. I generally ignore my symptoms and power through because I'm no fan of fussing, but this strikes me as a little stranger than dry eyes and creaky joints.