Nestlé Skin Health’s Differin brand has launched “Retinoid Education Week,” billed as  a week-long mission to educate the more than 50 million Americans with acne about how retinoids have revolutionized the way people treat their condition.   “Retinoids – one of the most effective ingredients available to treat acne – were only available to consumers by prescription until last year, and are now widely available over-the-counter,” said June Risser, VP and general manager, consumer b...