speckle

(noun) a small contrasting part of something. Synonyms: spot, dapple, patch, fleck, maculation. Examples: "A bald spot." "A leopard's spots." "A patch of clouds." "Patches of thin ice." "A fleck of red."

(verb) produce a mottled effect. Synonyms: stipple. Example: "The sunlight stippled the trees."

(verb) mark with small spots. Synonyms: bespeckle. Example: "Speckle the wall with tiny yellow spots."