What causes Acne? It is thought that the increased production of the Testosterone hormone and natural oils in the body during the teenage years is responsible for the formation of pimples. However other physical and genetic factors may also play a role. Stress, psychological disturbances, and irregular living habits can also bring on Acne. Acne is never caused by “dirty” skin. It can however be made worse by not having proper hygiene practices. Cleansing the face with a chemical free cleanser 2 times a day is strongly recommended to remove excess oil, dead skin cells and bacteria. You CAN over clean the skin, which can bring on more break outs. If you.