Tattoo

A tattoo is a form of body modification that made by inserting indelible ink into the dermis layer of the skin to change the pigment.

In mainstream Smurfs media, Hefty is the only known Smurf character who has a tattoo mark, a heart that appears on either or both upper arms. In the EMPATH: The Luckiest Smurf story series, Hefty's heart mark on his right upper arm is actually a birthmark while the one on his left upper arm is a tattoo. There is also Swimmer Smurf who has a blue fish tattoo on both his upper arms.

Psyches have tattoos in the form of their designation code branded on the back of their heads when they first emerge from their gestation chambers to begin their training. Empath was also branded in the same fashion, which makes him feel rather embarrassed to show his bald head in public during his later years in Psychelia.