Why is my face clearer the next day when i eat chocolate?

I'm 16 and have had acne issues since 12. I've never been a fan of chocolate and didn't eat it often, but recently I've been having a huge craving for chocolate and I've noticed whenever I eat chocolate (mostly Hershey's almond chocolate) the next day I wake up and my face is a lot clearer. When i stop eating atleast a chocolate bar a day my face gets covored in acne. This has happened to me every single time that I've eaten chocolate so far.