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If the right leg is an inch wider than the left and this is a new finding then you need to have a deep vein thrombosis ruled out. the fact that there is no tenderness to the calf muscle does reduce this being a DVT but only an actual evaluation can be sure that this is benign.
If DVT has been ruled out, or this is a long standing issue then it may be due to either muscle wasting secondary on the left secondary to nerve damage, or increased muscle bulk on the right due to imbalance in exercise.
But there is no way to be sure so the first thing is to see your family doctor who can then refer you as appropriate.