While everyone with mature skin wants to address wrinkle prevention, other summer issues do pop up, including blotchiness and adult acne. Dermatologist Patricia Wexler, who works with Christie Brinkley, advises clients to treat each problem individually. For wrinkles, she recommends products with peptides and retinoids that stimulate collagen. If you get blotchy, products with hydroquinone will prevent irregular pigmentationapply especially well over bony areas. And just like when you were in your teens, salicylic acid is still the best treatment for acne.