Instant Plastic Surgery

In the real world, plastic surgery is a long and painful process, with clearly-defined limits on what can be accomplished. Thankfully, in a magical, or sufficiently futuristic setting, things are a lot more simplified; all you need is the right spell, artefact, or professional, and minutes later you can be taller, prettier, or a fully-fledged member of the opposite sex. Heck, why not all three?

A popular trope in video-games and high fantasy, where often the only limit to these fantastical transformations is the inability to swap races, and sometimes not even then.

When used to change a character's sex, this is a form of Easy Sex Change. Not to be confused with Magic Plastic Surgery, which is when real plastic surgery techniques are portrayed as this.

Fan Works

 * A great number of The Legend of Zelda: Ocarina of Time fan works are based on Zelda's disguise being this, rather than simply an illusion spell of some kind.

Film

 * The Happily Ever After potion in Shrek 2 is able to transform Shrek and Fiona into humans, and Donkey into a stallion. Only lasts for a day, unless sealed with true love's kiss by the stroke of midnight..
 * What happens to Dragon under the effect of this potion anyway?

Literature

 * In The Belles, Belles are supposed to have this power. They can shapeshift different looks on any paying customer. The Big Bad Sophia, spare to the New Orleans throne, finds this power intriguing and wants to control it all. Why?.
 * Aza in Gail Carson Levine's Fairest gets it in her head to try and find these in the Ayorthian libraries. She hates how she's tall with pale skin, red lips and black hair; it makes her look ghastly. The first attempt, a singing spell, doesn't go well; it nearly turns her to stone. While her body revives, her big toe remains stone as a reminder of the near-miss..
 * Justified in Scott Westerfeld's original Uglies trilogy. While the surgeries themselves are not necessarily easy to get-- they do require anesthetic and have to make adjustments-- they are more convenient than they would be in real life. Books two and three start with Tally suffering no physical complications from . Emotional complications, however, are another matter: . We also find out that surgeries have more complications when performed on people with brain damage, because there's a high risk of the tissues being rejected..

Live-Action TV

 * The Twilight Zone episode "Number 12 Looks Just Like You" explains there is a process called The Transformation. It will make anyone beautiful from a limited set of body types and looks, and extend their lifespan. Marilyn, the protagonist who is "pretty" but not beautiful, shocks her family and the doctor wanting to operate her by saying that she doesn't want to look beautiful. She says that she wants to stay as herself, in mind and body.

Tabletop Games

 * In Vampire: The Masquerade, this is but one of the many, many miraculous wonders the Tzimisce are capable of through their unique power of Vicissitude. Laughably, raising your Appearance score using the power is Difficulty 10 (in OWOD, Difficulty is what you have to roll to succeed; the game uses a ten-sided die, so...), and if you suffer Critical Failure you get uglier.
 * There are some things that even Vicissitude can't do—trying to change a Nosferatu's appearance is impossible.
 * Changes that make them prettier, anyway. Changes that make them uglier, or cosmetically status quo (don't move their appearance trait at all) stick, while improvements 'heal' painfully in minutes. Makes sense considering Clan weaknesses are a malevolent curse rather than a genetic quirk to be fixed.

Video Games

 * Once you craft a make-up table and mirror in Animal Crossing: New Horizons, you are free to alter your appearance in it at any time.
 * City of Heroes: Thanks to the Super Science Super Booster, heroes and villains can now easily change the size and shape of their bodies, even switch genders. Of course, in a world where there is a black market for magical artifacts and super science is used daily, this is pretty well Justified.
 * This is the in-universe excuse for Shepard's appearance if you change it between Mass Effect 1 and Mass Effect 2; s/he died in the interim and had to be completely rebuilt.
 * Star Wars The Old Republic has "Appearance Designer Kiosk's" that can provide this service, provided you have enough Cartel Coins.
 * World of Warcraft barbers can change your gender, hair, facial features, and skin colour.
 * Galathil from Skyrim offers this service for an affordable price down in The Ragged Flagon.
 * In the world of Elden Ring, one need only approach the Clouded Mirror Stand to change your age, gender, or any other cosmetic features of your character.
 * You can build a "Dressing Table" (which is a mirror attached to a small storage desk) after the first chunk of Dragon Quest Builders 2. It actually gives significantly more options than initial character customization offered, and allows setting any armor or weapon you've obtained as your appearance instead what you actually have equipped..