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What you are describing is fairly typical with a severe sprain. Depending on the severity of the brusing, the tissue will take time to heal and return to a normal coloring. I would not be too concerned right now unless it seems to be bothering you worse. In which case, you should seek medical help immediately. The swelling is also fairly common. Often alternating between moist heat & cold packs can help to ease discomfort and alleviate the swelling.
If you are still unsure, then I recommend you contact your physician to rule out other complications from the sprain.
If i can be of any further assistance, feel free to write again. Take care & a speedy healing!