noun

a large irregular patch or unsightly mark on the skin or another surface.

red blotches on her face

patch,smudge,pop,dot,spot,speck,speckle,blot,stain,smear,streak,dab,daub,splash,splotch,splodge,rash,blemish,freckle,birthmark,strawberry mark,port wine stain,eruption,mark,discoloration,naevus,haemangioma

verb

cover with blotches.

her face was blotched and swollen with crying

spot,mark,speck,speckle,smudge,smear,streak,blemish,cover with blotches