The US prestige beauty industry reached $18.8 billion in 2018, a 6% sales increase over 2017, according to The NPD Group. The skin care category grew by 13% and contributed 60% of the industry’s total gains; makeup, the industry’s largest category based on sales, grew 1%, while fragrance closed the year up 4%. Hair was the smallest yet fastest growing category, with a 25% increase in sales.  “If I had to use one word to characterize the state of the US beauty industry today, it would be disru...