Discoloration

Noun

 * 1) The act of discoloring, or the state of being discolored; alteration of hue or appearance.
 * 2) A discolored spot; a stain.

Adjectives
repulsive; mottled; superficial; unsightly; dark; obtrusive.

Thesaurus
achromatization, birthmark, blanching, blaze, bleach, bleaching, blemish, blotch, brand, bruise, caste mark, check, checkmark, cicatrix, cut, dapple, decoloration, decolorization, decolorizing, discolor, discolorment, dot, earmark, engraving, etiolation, fading, fleck, flick, freckle, gash, graving, hack, jot, lentigo, lightening, macula, madder bleach, mark, market bleach, marking, mole, mottle, nevus, nick, notch, paling, patch, point, polka dot, prick, puncture, scar, scarification, score, scotch, scratch, scratching, speck, speckle, splash, splotch, spot, stain, stigma, strawberry mark, tattoo, tattoo mark, tick, tittle, watermark, whitening