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All answers having "Blemishes" as clue:

4 Character Answers:

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MARS



5 Character Answers:

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BLOTS

FLAWS

SCARS

SORES

SPOTS

WARTS



6 Character Answers:

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STAINS

TAINTS



7 Character Answers:

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STIGMAS



8 Character Answers:

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EYESORES

STIGMATA