fire - the event of something burning (often destructive); "they lost everything in the fire"

blemish, mar, defect - a mark or flaw that spoils the appearance of something (especially on a person's body); "a facial blemish"

blotch, splodge, splotch - an irregularly shaped spot

fingermark, fingerprint - a smudge made by a (dirty) finger

inkblot - a blot made with ink

rub - move over something with pressure; "rub my hands"; "rub oil into her skin"

resmudge - smudge again

dust - rub the dust over a surface so as to blur the outlines of a shape; "The artist dusted the charcoal drawing down to a faint image"