A blemish is a small flaw. If you borrow your brother's brand new bicycle, you'd better be careful — what might seem like the tiniest blemish to you might be a horribly ruined paint job to him.

The classic example of a blemish is a pimple or other mark on your skin, but you can call any small defect a blemish — like a worm hole in an apple or a scrape on the side of your car. A flaw or fault in your personality or morals can also be called a blemish. You might say that the one time your dog accidentally nipped you is the only blemish on his reputation as a sweet, gentle pet.

Definitions of blemish
  1. noun
    a mark or flaw that spoils the appearance of something (especially on a person's body)
    “a facial blemish
    synonyms: defect, mar
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    birthmark, nevus
    a blemish on the skin that is formed before birth
    chatter mark
    a mark made by a chattering tool on the surface of a workpiece
    check, chip
    a mark left after a small piece has been chopped or broken off of something
    a blemish resulting from a break without complete separation of the parts
    dent, ding, divot, gouge, nick
    an impression in a surface (as made by a blow)
    a small congenital pigmented spot on the skin
    mark, scar, scrape, scratch
    an indication of damage
    burn, burn mark
    a place or area that has been burned (especially on a person's body)
    blot, daub, slur, smear, smirch, smudge, spot
    a blemish made by dirt
    a skin lesion that is a diagnostic sign of some disease
    verruca, wart
    (pathology) a firm abnormal elevated blemish on the skin; caused by a virus
    milium, whitehead
    a small whitish lump in the skin due to a clogged sebaceous gland
    blackhead, comedo
    a black-tipped plug clogging a pore of the skin
    a fine crack in a glaze or other surface
    a small gouge (as in the cover of a book)
    cigarette burn
    a burn mark left by a smoldering cigarette
    blotch, splodge, splotch
    an irregularly shaped spot
    fingermark, fingerprint
    a smudge made by a (dirty) finger
    a blot made with ink
    nevus flammeus, port-wine stain
    a flat birthmark varying from pink to purple
    hemangioma simplex, strawberry, strawberry mark
    a soft red birthmark
    common wart
    a benign growth (often with a rough surface)
    condyloma acuminatum, genital wart, venereal wart, verruca acuminata
    a small benign wart on or around the genitals and anus
    juvenile wart
    a small benign growth on the faces of hands of children
    plantar wart
    a wart occurring on the sole of the foot
    type of:
    appearance, visual aspect
    outward or visible aspect of a person or thing
  2. verb
    mar or spoil the appearance of
    synonyms: deface, disfigure
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    mangle, maul
    injure badly by beating
    mark, pit, pock, scar
    mark with a scar
    mark with or as if with pockmarks
    cicatrise, cicatrize
    form a scar, after an injury
    type of:
    deflower, impair, mar, spoil, vitiate
    make imperfect
  3. verb
    mar or impair with a flaw
    “her face was blemished
    synonyms: spot
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    type of:
    begrime, bemire, colly, dirty, grime, soil
    make soiled, filthy, or dirty
  4. verb
    add a flaw or blemish to; make imperfect or defective
    synonyms: flaw
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    type of:
    inflict damage upon
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