Nobody is completely sure what causes acne. Experts believe the primary cause is a rise in androgen levels - androgen is a type of hormone. Androgen levels rise when a human becomes an adolescent. Rising androgen levels make the oil glands under your skin grow; the enlarged gland produces more oil. Excessive sebum can break down cellular walls in your pores, causing bacteria to grow.
Some studies indicate that a susceptibility to acne could also be genetic. Some medications that contain androgen and lithium may cause acne. Greasy cosmetics may cause acne in some susceptible people. Hormone changes during pregnancy may cause acne either to develop for the first time, or to recur.
You’re eating spicy foods. Spicy foods often contain tomatoes and peppers, which contain acidic lycopene that can be an irritant to some people, throwing off their skin’s pH levels and triggering breakouts. However, it isn’t just spicy foods that can irritate your skin. Some people have an aversion to dairy, bread, or other types of foods — how your skin reacts to what you eat just depends on your own personal make-up
You’re using products that contain pore-clogging ingredients. Mineral oil is a super-heavy moisturizing agent found in some lotions, but it’s also known to clog your pores and break you out. Silicones in skin care and cosmetics are also another ingredient on the list to watch out for that can clog your pores
Your hair products are wreaking havoc on your skin. The sulfates (cleansing agents), heavy moisturizing agents, and silicones that your shampoo, conditioner, and stylers contain can seep into your pores, clogging them and resulting in chest acne, bacne, or pesky pimples along your hairline