Call me crazy, but couldn’t finding a means to remove the Cutie Mark itself cure the condition?
 
(I can’t find the ask button on the tumblr.)

Bandy: I don’t care how many years I have left, as long as I can spend them with you.
 
Rainbow Dash: teary eyes

Drako:  
You’re not the only person here to have this you know?  
the two of them look up at Drako  
there’s a reason I have a list of medical complaints as long as my arm  
i can stand as a personal testament that it doesn’t have to be that bad  
you see  
i have Stigmosis too  
Dash:  
WHAT?  
But you’re fine  
There’s nothing wrong with you?  
Drako:  
look at me  
every part of my body is covered with clothing apart from my face  
look here  
pulls sleeve up  
arm is hideously scarred  
Dash:  
gasp  
Drako:  
rolls sleeve down  
the same can be said for the rest of my body  
there’s no way to stop it  
but you can make it tolerable  
and even the untimely end can be prevented  
i’ve lived 3000 plus years and i’m still standing  
i always hoped i’d find another case  
but they always died before i got to them  
or people pushed me away before i could do anything  
now i’ve got a chance to help a fellow sufferer  
Dash:  
why isn’t your face scarred?  
Drako:  
cosmetic surgery  
you should have seen what i looked like before  
Dash:  
so what can be done doctor?  
Drako:  
well  
i’ve got a few well used tricks up my sleeves

wouldn’t the text use female pronouns?

Yay, unnecessary drama from out of nowhere!  
What’s next, Rainbow Dash becomes a vampirewolf?

Well, that’s a spirit breaker.

That was written at 2 in the morning dont judge me…

Yorec, i know right?

And eventually their bodies just shut down… :-(

“Symptomatic” has a “Y” in it. Just nitpicking here.

Well that…sucks.
 
Also, they spelled “symptom” wrong.

Woah woah woah. There’s an ask tumblr with the bandage pony and Dash?