My right Bicep vein seems to ball up to the size of a large lima bean at the location of the bicep vein where it meets and disappears under the shoulder muscle. No pain. No redness or swelling of the arm. No unusual sensations at all. Seems to have become bigger over the last 2 months and only occurs when working out (lifting weights/ cardio). When i am at rest it is not visible. Afraid its a clog or clot or maybe the blood is pooling up here and could burst the vein?