Most people don't know this, but the face is kind of like the body. For example, look at the nose, the nose is kind of like the heart in that, if you have heart problems it can show up on your nose. If you've ever seen older men with red, blotchy marks on the tip of their nose, they usually have had heart problems. That's the chinese way of looking at skin. The chinese face mapping consists of the human body and its parts, it's very interesting.
However, certain things can bring up acne, for example, if you've had too much alcohol, maybe were eating really badly the night before (had pizza, french fries, milk shake) it will show up in that little triangle of skin between the eyes (called the over-indulger), maybe not always in acne, but other things like puffiness, redness. If you have gum or tooth problems it can show up on the lower parts of the cheeks, upper is usually due to allergies or sinuses.