I cannot heal illnesses, but I've yet to come across a physical wound I could not heal. [Watch the new Champions DLC completely joss all of this somehow.] However, it might take longer to do depending on how severe the wound is.

['Certain creatures' he says, and again her gaze goes briefly to his ears and then focuses on his face again] What other creatures exist in your world? Humans, I imagine? Most worlds seem to have those, at least.