Fever Fudge is a type of sweet made by Fred and George Weasley for their Skiving Snackbox. Fever Fudge is designed to make the one who eats it get a high fever within seconds of eating it, but the side effects are large, pus-filled boils, which appear at places that the twins don't "generally display to the public", and they make "sitting on a broom a right pain in the" said place. These boils may be eliminated with some Murtlap Essence. This side-effect was only mentioned for an in-development version of the sweet and may have been eliminated prior to its final release to the public. In the 1995–1996 school year, while the twins were still at school, this was one of the many Skiving Snackbox sweet variety they sold and tested on students, and they were used to allow students to skip classes, but mainly as part of the Umbridge-itis disease to annoy the tyrannical Dolores Umbridge.