... difficultiesassociated with the condition. Item content was developed for early versions of two PRO measures of the symptomsand emotional impact of oily facial skin. The psychometric validation of these measures ... blackheads.Sensation of oily skinWhen asked about the non-tactile sensation of oily skin,consistent with the treatment satisfaction focus groups, alarge proportion of the participants (68%, ... open-ended questions, responded tofocused probes posted by the moderators, and respondedto the opinions of other participants. Unlike traditionalfocus groups, respondents' worked on their own...