The Collaborative International Dictionary of English v.0.48:

Pucker \Puck"er\, v. t. & i. [imp. & p. p. Puckered; p. pr. &
   vb. n. Puckering.] [From Poke a pocket, small bag.]
   To gather into small folds or wrinkles; to contract into
   ridges and furrows; to corrugate; -- often with up; as, to
   pucker up the mouth. "His skin [was] puckered up in
   wrinkles." --Spectator.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "puckering":
   abbreviation, astriction, astringency, bottleneck, cervix,
   circumscription, coarctation, compactedness, compaction,
   compression, compressure, concentration, condensation,
   consolidation, constriction, constringency, contraction,
   contracture, curtailment, decrease, diminuendo, hourglass,
   hourglass figure, isthmus, knitting, narrow place, narrowing, neck,
   pursing, reduction, shortening, solidification, stranglement,
   strangulation, striction, stricture, systole, wasp waist,
   wrinkling