Sup so my face is visibly darker above my collarbone and lighter on the chest

So I've been getting back to my earlier physique slowly and i realised the difference between both the parts. please help.

also if there's smth for hands too cuz they were exposed one-day and since then they are visibly darker as well.

i have an oily, acne prone skin so i have to be careful w products but i think ordinary/minimalist stuff works.

please help girls or guys