Pimple, dark spots and pigmentation.

I got pimple while using niacinamide (myglam) serum and also it got worse with (momsco) face toner so both leads to fungal infection in my whole face... And I don't know how to reduce that...I got heavy dark spots on my face.. I wanna reduce this all issues... Before using this... product I don't have a single pimple in my face..soo I prepared a shedule pls verify this  (Am) kojic acid face wash followed by kojic acid serum both (derma co) brand. At (PM) vitamin c face wash followed by vitamin c night cream both Garnier brand. I mentioned the brand because while I'm using niacinamide it contains AHA (myglam) brand and the toner also contains  AHA . when I got a problem I started to verify the product the result (we should't pair a niacinamide serum with AHA ) soo the mistake is placed on the brand... In my point of view thts why Im sharing the brand...give me a perfect solution 🙂 Im waiting for the response