Points said to be knocked off (for blemishes?) (5)

I believe the answer is:

spots

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'blemishes?' is the definition.
(spot is a kind of blemish)

I can't explain the remainder of the clue.

(Other definitions for spots that I've seen before include "Sees" , "Picks out" , "Acne" , "Espies the blobs?" , "Catches sight of" .)

I've seen this clue in the Evening Standard.

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