Shireen Baratheon was a bright and pleasant girl. After seeing her, Jon did not mind taking her in and offering her his protection. Her greyscale left him a bit baffled. He was no expert in magical healing, but after more than three centuries of knowledge, he knew more than a thing or two. Greyscale was not a mundane disease and had a similar magical signature to a curse while also containing traces of the water and earth elements. The curse lay dormant under the hardened skin, and it seemed like it had run out of power. Whatever the maesters had done to treat her had permanently hindered the greyscale's spread and rendered it inert. But it was still there, lurking underneath. Given time, Jon could figure out a way to counter the curse, purge the elements, and completely remove the infected flesh from her body. But that was a task for later.