What would cause a previous contusion to hurt after a fever?!

Question: My friend had a bad fall several years ago. Recently she had a fever and now the area of the contusion hurts. Any ideas why?
Answers:
Perhaps there is some damage where the original contusion was and the fever targeted the weak spot. If it is several years later i'm sure there is nothing to worry about.
Answers:

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What would cause a previous contusion to hurt after a fever?!

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