Birthmark

Etymology
birth + mark

Noun

 * 1) A mark on the skin formed before birth.

Thesaurus
blackhead, blaze, bleb, blemish, blister, blotch, brand, bulla, caste mark, character, check, checkmark, cicatrix, comedo, crack, crater, craze, cut, dapple, defacement, defect, deformation, deformity, discoloration, disfiguration, disfigurement, distortion, dot, earmark, engraving, fault, feature, flaw, fleck, flick, freckle, gash, graving, hack, hemangioma, hickey, jot, keloid, kink, lentigo, macula, mark, marking, milium, mole, mottle, needle scar, nevus, nick, notch, patch, pimple, pit, pock, pockmark, point, polka dot, port-wine mark, port-wine stain, prick, puncture, pustule, rift, scab, scar, scarification, score, scotch, scratch, scratching, sebaceous cyst, speck, speckle, splash, split, splotch, spot, stain, stigma, strawberry mark, sty, tattoo, tattoo mark, tick, tittle, track, trait, travail, twist, verruca, vesicle, wale, warp, wart, watermark, weal, welt, wen, whitehead