Assertion: common skin problem | /r/HasProperty | marked by painful pimples
Facets:
value: sometimes,
type: TEMPORAL
Source sentences:
text: More than 85% of teenagers have this common skin problem , which is marked by clogged pores (whiteheads, blackheads), painful pimples, and, sometimes, hard, deep lumps on the face, neck, shoulders, chest, back, and upper arms.