My boyfriend has a large vein that has appeared, raised and under his skin across his stomach, running from one side to the other. He says it it very tender and painful. His right forearm has been doing the same thing. He has issues with his blood either being too thick or too thin and the doctors give him more or less cumedine to take depending on his situation at the time. He has trouble with vericose veins as well & was put on disability after a life threatening bursting of those veins. A stent has also been put in his groin area to help with the bloodflow to his lower extremeties. What could be the issue of these new veins appearing on his body?