Sentence:  ‘Children crawled over each other like little grey worms in the gutters,' he said. ‘The only red things about them were their buttocks and they were raw. Their <WSD>faces</WSD> looked as if snails had slimed on them and their mothers were like great sick beasts whose byres had never been cleared.nb...' 
Meaning of the word marked with <WSD> tags:  The front part of the head, featuring the eyes, nose, and mouth and the surrounding area.