It was an old building like Clawstone; it looked in fact as though the hill it stood on had come out in enormous, red brick boils.
A "boil" is a kind of skin infection that creates a large swelling. The writer is likening the buildings to boils that are made of red brick.
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A "boil" is a kind of skin infection that creates a large swelling. The writer is likening the buildings to boils that are made of red brick.