With hundreds of new doors opening in various formats, expanding cosmetics specialty and vertically integrated stores that have grown at a compound annual growth rate of nearly 19% during the past five years—Ulta, Sephora, Bluemercury, NYX, Kiko Milano and e.l.f., for example—account for an estimated 20% of total beauty market sales, according to Kline’s new report, Beauty Retailing USA: Channel Analysis and Opportunities. “While traditional department stores experience declining traffic an...