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Knowing Your Body• Menstruation may begin. Menstruation is a woman's monthly bleeding. It is also calledmenses, menstrual period, or period. When a woman has her period, she ismenstruating. The menstrual blood is partly blood and partly tissue from the inside ofthe uterus (womb). It flows from the uterus through the small opening in the cervix,and passes out of the body through the vagina.• Acne and pimples may develop leading to stress about body image. Pimples are thecommonest of all chronic disorders in your age group. This is the result of hormonalchanges that activate your sebaceous gland. Usually this is a temporary condition thatwill eradicate, as you will grow up. Balanced diet and personal hygiene helps to correctthis condition.12