The provided sources examine the biological and environmental drivers of skin conditions, with a primary focus on the pathophysiology and treatment of acne across different life stages. Research highlights how hormonal fluctuations—particularly elevated androgens—stimulate the sebaceous glands to produce excess oil, a process central to both adolescent breakouts and adult conditions like PCOS. While teenage acne typically affects the T-zone, adult acne often appears as inflammatory or cystic lesions along the jawline and is heavily influenced by stress, genetics, and lifestyle factors such as diet and pollution. Clinical management is evolving through multidisciplinary approaches, utilizing traditional topical re ...