Makeup, exfoliation, hydration, or masking are no longer a regimen limited to women. Male grooming has undergone a dramatic change over the past several years to become one of beauty's most dynamic segments, reaching a $4.5 billion mark in 2016, according to Kline's latest study covering the U.S. male grooming market. “The taboos are slowly dropping, and a growing number of men are using anti-aging serums and masks, beauty devices, and even makeup,” says Naira Aslanian, ...