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Hi Ed. While ultrasound is not a perfect test, it's reassuring they did not find a clot. That rules out a clot in the deeper veins usually. You could still have a clot (on inflammation) in one of your superficial veins. These are the ones closer to the surface that we can often see under the skin. They are often bluish in color and curvy like a snake. When inflammed, we call it "thrombophlebitis" and treat it with warm compresses and anti-inflammatories. Prednisone might help in this regard as it is an anti-inflammatory. In cases where an infection exists, or is suspected, antibiotics may be needed to promote improvement.
Does this make sense to you?