It is because of metformin?

I've been taking metformin for 2 days and was wondering if it's working. I've had darker lines like this since I've started the metformin. Does this mean it's helping my body with ovulation. YES I KNOW IT'S NEGATIVE! My levels of testosterone are high and they said I probably have PCOS. That's why my gyno prescribed me metformin plus then he did blood work. What are your thoughts?

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