There is a lot remedies for acne, but what is the best with no second consequences?

Sometimes my face get full of acne, but I don’t know why…I dont eat candies like chocolate, or cheetos, I drink just water and I make my own juice of apple, carrots and orange juice and mix…im skinny and I know my face get full of acne even if I eat just a little of something fatty, please how xan I stop it? I have 18.