Yes!! Believe it or not I have a friend who just had this happen a while back with her girl. She was doing an odd mouth movement and took her to the vet (I went with her). It was really weird. The vet opened up her mouth and pointed out two ulcers on the roof of her mouth. This is what they call it And this is what they said about it
She was put on prednisone (short term) and it is considered genetic.
She has spontanious collection of cells which form ulcers. She will probably get them for the rest of her life.
Hope this helps.
Loving mom to Jake, Shelby and Micah