flyspeck

Housefly excrement, visible as a minuscule black dot.

“The wall of the kitchen above the fruitbowl was dotted with flyspeck.”

(by extension) Anything tiny or insignificant.

“From the foothills below, Jean, Jan, and James were mere flyspecks, easily lost among the straggly pines that formed the treeline.”

To bespeckle with tiny spatters of color.

To inspect in minute detail to ensure that something contains no flaws; nitpick.