B.M.
M.,
I worked for a vet for 9 years and the majority of animals we saw that had Cherry Eye needed surgery to repair it. Sometimes it will come and go. But you can expect it to return. It's actually a gland that is protruding. With a Pug mix you do worry about the eyes becoming irritated. Sometimes drops can help to moisten the eyes. Also if it's in one eye you shouldn't be surprised if it happens in the other. I would suggest that you see your vet and have the surgery done. Hope this helps.
B.