Acne is a disease of the philosebaceous unit. What does that mean in English? Well, your body's oil travels to the surface of your skin. If there is blockage or congestion, acne happens.
Here are three reasons why your pores may be clogged:
1. Excess dead skin cells mixed with oil your skin produces.
2. Collapsed follicles. Think ingrown hairs. Have you ever had a clogged hair follicle? These can turn into infections quickly.
3. Using products that have pore-clogging ingredients.