Billie Eilish has several tattoos, but the specific locations of all of them are not publicly known. She has, however, shown and spoken about one of her tattoos, which is located on her upper thigh. The tattoo is a black line drawing of the character Blohsh, which is also the name of Eilish's clothing line.
It is worth noting that Eilish has expressed a desire to keep some of her tattoos hidden and has worn clothing that covers her arms and legs in public appearances. She has also spoken about her reluctance to share too much of her personal life with the public and has been vocal about the pressures of fame and the scrutiny that comes with it.