Bn - "sand" On Cheek

[dobbygolem]

My male BN, which has once gone through whitespot (maybe twice) in the last half year, now seems to have something on his "cheek". It's just below the eye, and right of the bristle furthest up his "nose". It looks kind of like sand, and its in one small patch. It seems to be stuck to him, as some of it is dangling off and training (not coming off, just following the rest).

Is this anything to be worrying about? Or is it just something that has caused his face to get sticky?

Could lettuce cause his face to get sticky and get sand stuck to it?

I haven't heard of anything like this before i dont think