By Katie Harrington

The barbering community has always been keen to offer up hair tattoos to their discriminating clients, but this season the mainstream has gotten hold of the concept, and it’s trending like mad. Consumer beauty destinations like POPSUGAR and Allure.com are touting the “sneakiness” of the look—clients who can’t display the patterns 24/7 can conceal them on undercuts beneath longer sections until it’s OK to let them come out to play.

Sam Daly (@bottleblonde76) is one of today’s most sought-after hair…