Chalk-based treatment for skin complaint (10)

I believe the answer is:

blackheads

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'for skin complaint' is the definition.
I can't tell whether this definition defines the answer.

'chalk-based treatment' is the wordplay.
'treatment' indicates an anagram (the letters must be processed or treated).
'chalk'+'based'='chalkbased'
'chalkbased' is an anagram of 'BLACKHEADS'.

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I've seen this clue in The Independent.

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