[Name] Cutie Pox [Source] My Little Pony: Friendship Is Magic [Symptoms] 
A magic-borne disease that affects the ponies of Equestria, causing them to sprout Cutie Marks all over their body and uncontrollably act out the talents that they represent. It disappears on its own, but can be quickly cured by consuming a flower sprouted from the Seeds of Truth. Apple Bloom accidentally infected herself with Cutie Pox when she used a magic plant called Heart's Desire to create a potion that would give her a Cutie Mark; she confessed to stealing the Heart's Desire from Zecora in order to sprout the Seeds of Truth and gain the cure.