birthmark, bleb, blemish, blister, bulla, check, cicatrix, comedo, crack, crater, craze, defacement, defect, deformation, deformity, disfiguration, disfigurement, distortion, fault, flaw, freckle, hemangioma, hickey, keloid, kink, lentigo, milium, mole, needle scar, nevus, pimple, pit, pock, pockmark, port-wine mark, port-wine stain, pustule, rift, scab, scar, scratch, sebaceous cyst, split, strawberry mark, sty, track, twist, verruca, vesicle, wale, warp, wart, weal, welt, wen, whitehead

For further exploring for "blackhead" in Webster Dictionary Online

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