Painful swelling (4)

I think it could be either:

Which length description are you looking for?:

boil

(Other definitions for boil that I've seen before include "Abscess" , "Seethe - painful swelling" , "Cook, swelling" , "Bubble up - inflamed swelling" , "Skin swelling; cause to evaporate" .)

I've seen this clue in The Independent.

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