RT Book, Section A1 Bogle, Melissa A. A2 Ali, Asra SR Print(0) ID 1176112245 T1 Cosmetic Dermatology T2 McGraw-Hill Education Specialty Board Review Dermatology: A Pictorial Review, 3e YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 9780071793230 LK dermatology.mhmedical.com/content.aspx?aid=1176112245 RD 2024/04/24 AB Intrinsic aging: natural or chronologic aging, influenced by geneticsBegins in the mid-20s, but signs may not be visible for decadesCollagen production and cell turnover slowsLoss of subcutaneous fat and bone loss contribute to volume issuesExtrinsic aging: caused by environmental factorsLargest contributors are ultraviolet (UV) radiation (photoaging) and smokingFacial expressions, sleeping positions, nutrition, and airborne particles (pollution) are additive factorsSolar elastosis or dermatoheliosis: term applied to the chronic inflammatory changes and degradation of elastin and collagen