Crossword Genius

Blemishes by crass carelessness (5)

Ross

I believe the answer is:

scars

I'm a little stuck... Click here to teach me more about this clue!

'blemishes' is the definition.
(scarring is a kind of blemishing)

'crass carelessness' is the wordplay.
'crass' can be anagrammed to 'SCARS'.
But, I am not clear how this is indicated.

'by' is the link.

Can you help me to learn more?

(Another definition for scars that I've seen is " Marks left by wounds".)

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