Suggest Treatment For Swollen And Bruised Foot After Treated Injury

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I was diagnosed with an avulsion fracture of the cuboid and put in a back slab for a week it's now off and I have been given an aircast boot for 4 weeks my foot is swollen an bruised the doc said my bone is ok and said it's a sprain but it is do painful and I still need my crutches to walk I am concerned that my bone is broken and the cast came off too soon