speckle
/ˈspekl; `spɛkl/ n
small mark or spot, esp one of many, often occurring as natural markings on a different coloured background (on the skin, feathers, eggs, etc) （皮肤、 羽毛、 蛋壳等上的）斑点, 色斑, 色点
brown speckles on a white egg 白色蛋上的褐斑
speckles of red in a blue background 蓝底红点儿.