What is the deal with these bruises moving?

Two weeks ago, I was sanding on a stair on a deck. They put little pieces of wood to hold the step. They put two common nails,very thin, very short to hold this wood. At the very least they should have used more nails, 8d instead of 6d, and rust proof galvovnized nails. The nails snapped and the stair fell like a... show more Two weeks ago, I was sanding on a stair on a deck. They put little pieces of wood to hold the step. They put two common nails,very thin, very short to hold this wood. At the very least they should have used more nails, 8d instead of 6d, and rust proof galvovnized nails. The nails snapped and the stair fell like a trap door. smashed both upper shins badly about 2-3" below he kneecaps. Bad bruises. Somehow they shifted down my shins to my ankles and heels. Seems strange. Still a lot of bruising, just not near the injury. Will they clear up on their own?
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