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A brown watery vaginal discharge sounds that it could potentially be associated with bacterial vaginosis ...that is a minor vaginal infection and not any STD if that is what is going on there ..
I would advise having that checked
If a case of bacterial vaginosis then it is readily treated such as with a course of Flagyl or METROGEL For example ...
It probably has nothing to do with the past polyp
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Anthony Bray MD