The itch is the annoying sensation you feel in your skin, not what you do to it. You scratch or rub an itch. He used to rub his thigh by inserting his hand in his pants pocket, so I guess he must be suffering from some kind of eczema.
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This morning hot water spilled from a/the bucket on to my legs, so the area is covered with blisters."I think 'full of blisters' is also correct, though it is not natural". Am I right?