Hello, I have been getting dark stains, blackish in colour on my underwear. I have no discharge and it is clear on wiping. I am 33 yrs old, no children, regular periods, and overweight ( which im finding hard to lose) i am also taking 100mg of zoloft per day. I have been told i might have low thyroid but blood tests come back normal . I have noticed that i ve been sweating excessively and it smells different to normal. Also my privates have a funny smell sometimes. Could it be a candida overgrowth??? Or something else? Thank you for your time! Mel