spot, speckle, dapple, patch, fleck, maculation -- (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")
Overview of verb speckle
The verb speckle has 2 senses
stipple, speckle -- (produce a mottled effect; "The sunlight stippled the trees")
speckle, bespeckle -- (mark with small spots; "speckle the wall with tiny yellow spots")