Our expert says:
If you are female there may be a hormonal imbalance. A condition called Polycystic ovary syndrome can cause acne, hirsutism(hairyness), abnormal menstruation, weight gain. You should visit your doctor - he may need to do a gynecological exam, organize a sonar of the ovaria, take blood for thyroid hormone, progesterone and esterogen, blood sugar and insulin levels.
See also http://www.4woman.gov/faq/polycystic-ovary-syndrome.cfm#h
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