Sentence:  The mouth was compressed, and on either side of it two tiny wrinkles had formed themselves in her cheeks. An infinity of slightly malicious amusement lurked in those little folds, in the <WSD>puckers</WSD> about the half-closed eyes, in the eyes themselves, bright and laughing between the narrowed lids. 
Meaning of the word marked with <WSD> tags:  A fold or wrinkle.