What Causes Acne
One of the main causes of acne are clogged hair follicles (comedones) that can get infected. A comedo occurs naturally and gradually as your skin cells multiply. It doesn’t always cause acne – in healthy skin, a comedo simply dissolves on its own.
However, if your immune system reacts to bacteria, lipids, or androgens (men’s sex hormones), a microinfection can occur under the skin, at first invisible to the naked eye. As a result of an overproduction of sebum, the infection develops and reaches a stage when you can see signs of acne on your skin.