They are designed to reduce or diminish the effects of aging. Many products seek to hide the effects of aging while others claim to alter the body's chemical balances to slow the physical effects of aging. A comprehensive grading scale for anti-aging of the skin has been validated and categorizes skin aging as: laxity (sagging), rhytids (wrinkles), and the various categories of photoaging, including erythema (redness), dyspigmentation (brown discolorations), solar elastosis (yellowing), keratoses (abnormal growths), and poor texture.[1]