Assertion: acne | /r/Causes | blackhead
Facets:
value: often
type: TEMPORAL
Source sentences:
text: It often causes whiteheads, blackheads or pimples, and usually appears on the face, forehead, chest, upper back and shoulders.
text: It often causes whiteheads, blackheads or pimples, and usually appears on the face, forehead, chest, upper back and shoulders.
text: It can cause blackheads, whiteheads, and pus-filled spots.
text: Acne can cause both blackheads and whiteheads, known as comedones.