Assertion: callus | /r/CapableOf | develop on the forehead
Facets:
value: from the frequent prostrations
type: CAUSE
Source sentences:
text: Calluses have also been known to develop on the forehead from the frequent prostrations required in Muslim prayer; known as a prayer bump or zebiba, such calluses are considered marks of piety in some Muslim countries, and people have been known to take special steps, such as praying on straw mats, to encourage the callus to develop.