please help! dark brown discharge for 2 weeks. yeast infection?

Ive had dark brown discharge for 2 weeks but it went down yesterday and its just light brown/pink. The texture wasn't watery but it was just a little bit clumpy and normal discharge consistency. It has no smell and I didn't have any symptoms. But now that the dark brown discharge is slowly going away, I start to itch down there and stings sometimes. And when I checked down there, there were white bumps in the inside of the opening.

image

image

That’s looking like a candidiasis. the part that sting might caused by dryness around that area

is candidiasis a yeast infection? its not an STI right?

Yes. and It’s rarely infected by sexual contact.

Do you know what the main cause for this?