![Spray applicator](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/2/26/Spray_applicator.jpg/revision/latest/scale-to-width-down/180?cb=20090531063800&path-prefix=en)
Chapel applying the plasti-skin
Plasti-skin was a topical anesthetic used for treating burns.
In the mid-2270s, as the USS Enterprise was struck by a plasma energy bolt fired from V'ger, Lieutenant Chekov suffered severe burns to his right wrist and hand when his weapons console overloaded. Using a spray applicator, Doctor Christine Chapel applied plasti-skin to his wounds. (Star Trek: The Motion Picture)
The name for this medication was from the shooting script.