pucker
puck-er
verb
To draw or gather a surface into small folds or wrinkles.
"She puckered her lips to kiss."
noun
A small fold or wrinkle on a surface, often fabric or skin.
"There was a slight pucker in the fabric."
Thesaurus
Synonyms: cockle, crumple, knit, rumple, ruck, ruck up, gather, tuck