Boiling Blister-WC

Intro I'm making another custom disease! This one is quite... gruesome... Leader:ColdStar-A deep blue tom with many scars. Deputy:DarkFoot-A grey tom with black paws. Medicine cat:SkyFeather-A white she-cat with long fur. Med App:FrecklePaw-An orange tom with red freckles. Elders:ScorchFur-A black she-cat with red spots. StoneLeg-A paralyzed grey tom with black stripes. Queens:LightStep-A tan she-cat with a white underbelly. Kits:SapKit-A warm brown tom with a white underbelly. Apprentices:ShallowPaw-A light blue tom with grey eyes. ApricotPaw-An orange-ish tan she-cat with blue eyes. AlderPaw-A cold brown she-cat with darker flecks. Warriors: FerretTail-A tan tom with a black ringed tail. StarlingFeather-A brown she-cat with yellow eyes. TreeRoot-A dark brown tom with grey ears. ThornSnap-A redish tom with darker spots. StripeClaw-A black and white she-cat with long claws. The clan is running low due to starvation... why, starclan... why? Stage 1: The cat feels itchy all over, Dry skin, fever. Stage 2: Itchiness continues, loosing fur, small bumps on the skin and back of the throat, Fever worsens. Stage 3: Large chunks of fur fall off, bumps become larger and filled with blood, breathing struggle, odd smell; like rotting flesh. Stage 4: Large bumps start to burst, spraying anything nearby in range, no fur, damaged skin, coughing up red spores that spread far, throat closed up. Stage 5: Skin either blown off or scratched off, coughing up red spores still, once dead, the body explodes. Can you cure it? Hint:Burnet, Marigold, and yarrow! VERY INFECTIOUS!!!! Be whoever you want, have fuuunnnn!!! BTW:no one knows about the sickness yet...