Multiple realities
(covers information from several alternate timelines)
Paris' patch of hair

Tom Paris pulls out a patch of his hair

Annorax's wife hair lock

A hair lock of Annorax's wife

Hair is a series of filaments of dead cells that grow on the skin of animals, usually mammals. In humanoids, hair often grows on the top of the head, where it is styled for cultural reasons. On mammals, it was generally termed "fur".

Individuals could be described in terms of their hair color, such as "blond(e)" (yellow/gold) (TOS: "Where No Man Has Gone Before", "Shore Leave"; TNG: "Too Short a Season") and "brunette" (brown) (TNG: "The Big Goodbye", "The Quality of Life")

One who cut hair as their profession was known as a barber. (TNG: "Data's Day", "Ensign Ro", "Starship Mine")

Scissors were used to cut hair. According to Mot, he found Klingon hair "thick and luxurious" and "a pleasure to cut". He suggested that Worf use a conditioning agent on his. (TNG: "Schisms")

The Federation Captain Jean-Luc Picard had been bald for most of his adult life. (Star Trek: The Next Generation, Star Trek Nemesis)

Guinan was attracted to bald men. (TNG: "Booby Trap")

In the alternate reality, Pavel Chekov's hair was curly, instead of straight like his prime reality counterpart. (Star Trek; Star Trek Into Darkness; Star Trek Beyond)

A thirteen year old Beverly Crusher changed her hair color from red to brunette, but dissatisfied with the result, quickly changed it back. While playing poker in William T. Riker's quarters in 2369, Beverly related this after Riker said he'd like to see her as a brunette, which piqued his curiosity further. She then agreed that changing her hair color would be her forfeit if one of the other players won. (TNG: "The Quality of Life")

In 2369, Jadzia Dax told Kira Nerys about Morn who was asking her for dinner. She declined but though that he was cute because of his seven or eight wiry hairs sticking out of his forehead. (DS9: "Progress")

When Lwaxana Troi asked Constable Odo about his hair, he told her that this was no real hair but a part of himself, the shapeshifter. She then asked curiously if he studied hairstyles, to which he replied that he imitated the style of the Bajoran who studied him. (DS9: "The Forsaken")

Notably without hair, the Bolian race have sometimes been seen to wear a toupée to hide this fact. (DS9: "The Muse") Bolian barbers included Mot and V'Sal. (TNG: "The Host", "Data's Day", "Ensign Ro")

The Krenim Annorax kept a lock of hair in a glass globe aboard his weapon ship. It was from his wife. (VOY: "Year of Hell")

In 2371, upon Kathryn Janeway claiming to be from Kalto Province, Terla remarked that she'd never seen a Kalton with her color of hair. Janeway replied, "Well, now you have." (VOY: "Time and Again")

When Seven of Nine was freed from the Borg Collective in 2374, The Doctor was able to stimulate her hair follicles to re-grow. (VOY: "The Gift") This was done at least once more, when, in 2376, Lyndsay Ballard returned to the crew of the USS Voyager as a Kobali. (VOY: "Ashes to Ashes")

In 2376, the assimilated Brunali Icheb recognized his mother's hair color, prompting First to threaten him with deactivation for wasting time on irrelevant matters. (VOY: "Collective")

Members of Dala's species tended to be bald, but could easily wear wigs to fake having hair. Despite this, at least some found it uncomfortable. (VOY: "Live Fast and Prosper")

In the anti-time future, Data dyed half of his hair grey to look older, a fashion choice Jessel abhorred, believing he resembled a skunk. (TNG: "All Good Things...")

In the final draft script of TOS: "Shore Leave", Kirk guessed that "a little blonde girl" whom McCoy had allegedly seen had "untidy hair", although he leaves out this detail in the final version of the episode.

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