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If there was any moisture inside the fitbit when you put it on to charge then it may have made things worse (water and electricity don't play nice).
I would put the fitbit is a sealed bag with dray rice for a day or 2 (the rice draws out the moisture). Then try charging again and if it's not working right try a restart ( https://help.fitbit.com/articles/en_US/Help_article/1186/ ).
Good luck!
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
The instructions were in that link. They are:
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