According to studies hormonal changes during adolescence causes the sebaceous glands to over produce sebum, hence the awkward oily face. Hormonal activity such as menstrual cycles and puberty causes the glands to get larger and make more sebum. Stress is also said to be a main cause of acne. It increases output of hormones from the adrenal or stress glands. Likewise, family or genetic history of a person is also a significant factor whether a person is more prone to acne. For example, if the rest of the family were suffering from acne during their adolescent period, expect the same with the younger siblings.
One of the reasons why this is so is because acne is a rather complicated condition that is not totally understood. The cause of acne can be very different from one person to the other. Furthermore, there are also many different types of acne. That is the reason why there are so many acne treatments available.
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