speckle

nouns

a small contrasting part of something
"a bald spot"; "a leopard's spots"; "a patch of clouds"; "patches of thin ice"; "a fleck of red"
dapple, fleck, maculation, patch, speckle, spot

verbs

produce a mottled effect
"The sunlight stippled the trees"
speckle, stipple
mark with small spots
"speckle the wall with tiny yellow spots"
bespeckle, speckle