What is another word for "blot"?

Roget's Thesaurus (1911) lists these synonyms for "blot": atramentous, birthmark, black, blackamoor, blacken, blackness, blain, blemish, blobber, blobber-lipped, bloodshot, blotch, blubber, blur, buck, charcoal, chiaroscuro, coal, coal-black, color, coon, crow, dark, darken, darkness, defect, deformity, denigrate, derogatory, deterioration, dingy, dirt, discolored, disfigure, disfigurement, dusky, dye, ebon, ebony, excrescence.