chapter  51
Percutaneous Absorption of Sunscreens
ByKenneth A. Walters, Michael S. Roberts
Pages 20

Ultraviolet radiation causes sunburn, premature aging of skin, and skin cancer. There is a considerable body of evidence that suggests that actinic keratosis, basal cell and squamous skin cancer, malignant melanoma, and cutaneous lupus erythematosis are exacerbated or triggered by sun exposure (1). Cancer prevention organizations (including the American Academy of Dermatology) have undertaken major efforts to educate the public to avoid unnecessary exposure to solar radiation. For these reasons, it is now common practice for manufacturers to include sunscreen active ingredients in many traditional cosmetic products (e.g., lipsticks, foundations, and moisturizers) as well as so-called ‘‘beach sunscreens.’’