Just because a product is on a shelf at your favorite retailer doesn’t mean it’s safe to use, especially when it comes to products we put on our children. There are many ingredients you want your tween or teen to avoid putting on their face.  In addition to avoiding synthetic fragrances, phthalates, parabens, sulfates, and chemical sunscreens, Aguilar says, she also suggests avoiding Retin-A "unless prescribed by a medical professional." These ingredients can damage the skin, causing more dryness, irritation, or even break down the skin’s natural barrier.