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Deep vein thrombosis (DVT) occurs when a blood clot forms in a deep vein in the leg or arm. There are two types of veins in the leg: superficial veins which lie just below the skin and can be seen on the surface, and deep veins which lie deep within the leg muscles.
A DVT is a blood clot that forms in a deep leg vein. Veins are blood vessels that take blood towards the heart. Deep leg veins are the larger veins that go through the muscles of the calf and thighs. They are not the veins that you can see just below the skin, neither are they the same as varicose veins.