EnglishLulu wrote:
I've absolutely no idea if this is relevant or not, might be a red herring, I don't even know if it affects children, but my father was briefly affected by something called Bell's palsy, and I very vaguely recall that's some kind of facial paralysis that can affect one side of the face. Could it be something like that?
Bell's palsy is more severe than what the OP is describing. The entire side of the face droops down- the mouth, eyes, etc. It is impossible for people to close the affected eye completely, so they have to have an elaborate wrap on it at night to prevent it from drying out. It also affects speech and eating. Bell's palsy is very obvious when you look at someone- they look like they've had a stroke.