sentences:  Historical and physical clues that may suggest hormone-sensitive acne include onset between ages 20 and 30; worsening the week before a woman's period; acne lesions predominantly over the jawline and chin; and inflammatory/nodular acne lesions.Several scales exist to grade the severity of acne vulgaris, but disagreement persists about the ideal one for diagnostic use.Cook's acne grading scale uses photographs to grade severity from 0 to 8, with higher numbers representing more severe acne.