system
Given the following post, respond as if you're commenting on Reddit:
human
[Game of Thrones] Can't Ser Jorah just hack off his sick arm?

Or has Greyscale contaminated his blood or something and there will be other grey spots growing elsewhere after some time?
gpt
He could, but it's not a 100% certain cure. Moreover, he doesn't necessarily want to. 

His counterpart in the books on the greyscale issue, Jon Connington, felt that it was better of him to ignore it so that he can assist his liege in claiming his destiny better full-bodied for as long as he can, rather than for a longer time as a one-armed cripple. 

Jorah probably feels the same, that he should serve Daenerys to his full capacity for what limited time he has left.