The edges of his mouth lifted as a thought occurred to him.

After a time, a pale smile came to the edges of her mouth.

A smile came and went at the edge of Lucas's mouth.

There's a satisfied smile playing around the edges of her mouth.

There seemed a tremor to the edge of his mouth.

I could see fat on the edges of her mouth.

Then a very small smile played on the edges of his mouth.

The edges of his mouth actually seemed to be turning up.

The smile at the edges of his mouth made Michael want to hit him.

The edges of her mouth did not so much as twitch.