Ключевые слова: acne, adolescence, anxiety, anxious, ashamed, bad, bashful, bite, biting, blackhead, blemish, chew, concerned, dermatology, embarrassed, european, face, finger, fingernail, fingernails, fingers, fit, gnaw, guy, habit, hand, handsome, hygiene, insecure, isolated, nail, nail biting, nervous, person, pimple, pinky, shy, skin, skincare, spot, squeeze, stress, teenager, timid, treatment, ugly, worry, young, zit,