Acne is an actual disease of the pores. It can be caused by certain drugs, medications or exposure to certain chemicals but most acne is an inherited tendency. Dead skin cells are shedding much to quickly in the acne-prone pore. It forms a lug along with sebum and hair this is where the problem begins. If the body doesn't see the plug as an invader, then it remains as a noninflamed lesion, aka blackhead. If it does, then it forms into pimples, pustules and cysts.