Crossword Genius

Oliver Cromwell's unbeauty spots? (5)

Ross

I believe the answer is:

warts

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'spots?' is the definition.
The definition and answer can be both human attributes as well as being plural nouns.
Maybe you can see an association between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for warts that I've seen before include "feature prominently on 12,14 across [UGLY SISTERS]" , "Verrucas" , "unwanted lumps" , "Skin growths" .)

I've seen this clue in the Evening Standard.
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