Christopher & Banks Womens Cardigan Sweater Small Cream Cascade Open Front Knit

Christopher & Banks Womens Cardigan Sweater Small Cream Cascade Open Front Knit Size Small Cream or Ivory with silver shimmer Cascade Open Front Knit 95% Acrylic 5% Other Fibers Pit to pit 20.5" flat Length 23.5" Dark spot on inside of neck collar. See pic. Not sure if its flaw in material or what Thank you for looking