If your kid's concerned that her face looks like pizza, it may actually be the pizza she's eating that's to blame. Dermatologists are finally identifying diet as a factor in both adult and teen acne—specifically, dairy products. So if you or your teen is breaking out, try eliminating dairy products. Yes, that means no more pizza or milkshakes for a while. But it might also mean no more zits or rumpshakes in the future.