Scar
A scar was a visible mark of replacement of the skin following injury or illness.

Because Doctor Temec found no obvious scar tissue upon examining Captain Jonathan Archer and Lieutenant Malcolm Reed in 2152, he told General Gosis that their deformities were not the work of a surgeon. ()

Hugh Culber had a scar that he had chosen to keep. It originated from an incident where he was hiking along the cliffs of Cabo Rojo and fell 15 meters and puncturing his shoulder in the process. A doctor named Kashkooli rescued him, stitching Culber's puncture wound closed with fishing line. The scar was gone after he was rescued from the mycelial plane. ()

In 2267, Spock described the outer hull of the  as being "pitted with meteor scars". ()

Kira Meru had a scar on the side of her face. Basso was ready to remove her for being "imperfect" but was stopped by Gul Dukat who healed the scar with a dermal regenerator. ()

The Ligonian Hagon had a scar on the left side of his face () as did the Klingon renegade Korris. ()

Admiral Mark Jameson revealed a scar on his right arm to Karnas in 2364 as a proof for his identity. ()

Scarface was a character in the holographic recreation of a Dixon Hill story. He had a scar on the right side of his face. ()

Jadzia Dax and Benjamin Sisko remembered the time when an Argosian lieutenant threw a drink into Sisko's face. When Sisko was up to attack the Argosian, Dax stopped him with a right cross. Sisko still had a small scar from this hit as of 2369. ()

The Terran marauder from the mirror universe had visible scars around his left eye. ()

In an alternate timeline in 2374, both Captain Kathryn Janeway and Tuvok had scars in their face. Tuvok was wounded and suffered from blindness when a chroniton torpedo exploded right in front of him and Captain Janeway's skin featured scars following third-degree burns from the fire in Deflector Control. ()

In 2375, when Chakotay took The Doctor up on his suggestion that a needle and thread be used to suture his boxing wounds, The Doctor suggested Chakotay would appreciate having a manly scar over his eye. ()

In 2380, Ensign Beckett Mariner had a number of scars from a variety of locations. Doctor T'Ana told her she looked like a scratching post. ()

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Medical conditions