Back or chest. I know it's easier to hide then on your face but at least facial acne is understandable. If anybody catches a peek of your bacne And when it is on your face, it's worst when it's on your nose because it hurts like hell to pop
Face, especially the nose. I remember that happened to me right before junior prom, so I had to like put makeup on my nose to cover it (only time I've ever used it).