Belly pox is a fictional outer space virus that Bumpywish ( https://derpibooru.org/profiles/AskBumpyWish ) came up with.
Well, seems like none of the little ponies in this pic mind it at all, they seem to have quite the blast actually <3
Featuring:
Jester Bells, Nixy dreamstar, CherryCheescake, Rubber Heart, Flavorful Sweets, Soulful, Sumica, Cyberhorse, Heart Polish, Hazel Nutt and my own horse Tai