As is always the case, this weird fashion trend came from the Japanese people. The bagel head, as the name suggests, involves injecting saline into the forehead to make it look bulged.
This procedure is so weird that it had to be featured on National Geographic series of taboo. 300-400 cc of medical grade saline is injected into the forehead which is then given a depression in the center leading to the formation of a bagel.
The big question surrounding this trend is a big “WHY?” And why specifically a bagel?
Luckily, this effect is temporary since the body absorbs the saline and the body goes back to normal after a day.