I've had acne since I was 15, and I'm now 30. For those 15 years I took antibiotics, used Differin, Retin-A, BP, salicylic acid, and anything else a doctor told me to try, for years at a time. Nothing worked and my skin was dry, sensitive, and I had painful acne that has left scars. I finally did an elimination diet (look it up, find a plan you can follow, then follow it to the letter) and my skin cleared up within two weeks. A month and a half later I added gluten back in to see if I broke out, and within 5 days I broke out all over my back and lower face, in really painful, inflamed red bumps. I took gluten out again, and within less than 2 weeks I was clear again. It's been close to 4 months now that I've been gluten-free and I've miraculously been acne free as well. I really hope some 15 year olds read this and save themselves a half of a lifetime of low self-esteem, scaring, expensive treatments, and general misery.
To those who say that gluten-free products are expensive: usually they aren't very healthy anyway, being high in sugar and other processed white grains like rice or corn, so just don't buy them! You can eat so many other things that nature already provided gluten-free, so skip the processed substitutes. Also, if you do want gluten free cereal and bread, it's going to be cheaper in the long run than prescription medications, over the counter creams, microdermabrasion for inevitable scarring, or laser treatment for leftover dark marks. Think of it that way.
Try it for a minimum of two months. You can make it that long, I promise. If you actually do it right, no cheating, you might get the miracle results I got too.