Junior
Junior is a 13-year-old tomboy with pimples. After being diagnosed with stomach flu, Junior's body undergoes a bizarre metamorphosis.
Starring Garance Marillier, Yacine N'Diaye, Aude Briant, Virgil Leclaire, Raphaël Mingau Lopes, Louis Dussol, Bernard Blancan, Virgile Bramly, Daisy Broom, Donatienne de Croisoeüil
Watch "Junior" on Mubi released in 2011. It's a fantasy and horror movie, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of movie.