You have inherited oily acne prone skin. This means you have a type of sebum that sticks together along with dead skin cells to create plugs deep within the pores. These are called microcomedones. An overabundance of bacteria feed off of this clogged oil, eventually causing inflammation and breakouts. Hormonal surges increase inflammation and oil production to exacerbate the problem. Your skin requires diligent use of keratolytics to clear the pores (Glycolic and Salicylic Acid) and anti-bacterial protocols to reduce blemishing (azelaic acid and salicylic acid).  Don't over dry your skin with traditional acne products which will only harden oil in the pores.  Investigate dietary triggers like dairy, wheat and sugar.  If you have infected blemishes you might need short term medication from your dermatologist.  However, most clients get great results by following these suggestions.