‘Why, no. I didn’t know you were a chaplain.’ Yossarian stared at him with a big, fascinated grin. ‘I’ve never really seen a chaplain before.’ The chaplain flushed again and gazed down at his hands. He was a slight man of about thirty-two with tan hair and brown diffident eyes. His face was narrow and rather pale. An innocent nest of ancient pimple pricks lay in the basin of each cheek. Yossarian wanted to help him.
Found a definition may fit in
A circular or oval valley or natural depression on the earth’s surface, especially one containing water:
Does it mean the hollow area(because chaplain was thin, so probably in the face too)at the centre of both cheeks?