<s>[INST] A few days ago I developed a sudden 2 inch diameter area of bruising and swelling at the back of my calf. It appears to be associated with a bulging vessel. There was some tenderness. It is now less tender and appears to be clearing up slightly now several days after its onset. Any idea what this is? [/INST] I understood your problem. Might be you involved in standing work for which there is engorgement of veins this could be result in varicose veins or deep vein thrombosis.I suggest my patients' limb elevation by applying pillow during bedtime and avoidance of much standing work.I generally suggest ultrasonography color Doppler to evaluate this kind of situations if not correct...hope you will be satisfied. </s>