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Severely swollen foot and turning black is a serious problem which cannot be neglected. Anyhow, physical examination is mandatory to properly assess this.
I feel that the symptoms described by you needs an emergency evaluation and treatment. Please visit a ER at the earliest. You also need to consult an Orthopedician and you may require, investigations like x ray
, CBC etc. Hope I have answered your query. Let me know if you have have any clarifications, you can close the discussion and rate the answer.
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Wish you good health!