Tattoo

A tattoo was a mark or design that was placed on the skin.

The newly regenerated Third Doctor sported a tattoo on one arm. (TV: Spearhead from Space) This was the convict tattoo mark made by the Time Lords to signify the Doctor was a convict. Similar dragon tattoos were placed on prisoners in Shada; they "snapped" when the prisoners were released. (PROSE: Christmas on a Rational Planet) Daniel Joyce had one of these tattoos. (PROSE: Unnatural History)

Members of the Scarlet Guard had their entire bodies tattooed with diagrams of Hysperon flora and fauna. After their deaths, Scarlet Empresses preserved the tattooed hides and heads of members of the guard and kept them in a gallery near the throne room of the Scarlet Palace. (PROSE: The Scarlet Empress)

Astrolabus had the star charts he stole tattooed onto his body. (COMIC: Once Upon a Time Lord)

Petronella Osgood was obsessed with numbering incarnations of the Doctor and had a tattoo of each one except the War Doctor, whom she did not know about. (PROSE: The Day of the Doctor)

The Twelfth Doctor was "against" tattoos. (TV: Thin Ice)

Iris Wildthyme had a tattoo of a "bumblebee riding a bike." (AUDIO: Iris Rides Out)

The signature emblem of the Corsair was a classical depiction of the mythological Ouroboros, a snake devouring its tail. According to the Eleventh Doctor, they had the emblem tattooed on their body after each regeneration. Without it, the Corsair didn't feel like him/herself. In his last regeneration, the tattoo appeared on the inside of his left forearm. (TV: The Doctor's Wife)

Lisa Summerton had a tattoo of a butterfly on her arm. (PROSE: The Dust of Ages)

The chronolocks used by Mayor Me in the trap street resembled tattoos. (TV: Face the Raven)

In 2016, when a female skin-peeling dragon came through the space-time rift in the school, she was imprinted on Tom Dawson's skin as a tattoo. (TV: The Coach with the Dragon Tattoo)

In 2050 June Turner was trapped in a nightmare caused by a Bodach. Jorjie Turner entered the nightmare of her mother. She made June think that she had a tattoo of Darius Pike. This caused June to wake up, which made her and K9 able to defeat the Bodach. When she realised that Jorjie didn't have the tattoo June was relieved. (TV: Dream-Eaters)