Heredity is a major cause, but diet and hormones affect it. Oil gland secretions can be increased by stress, hormonal activity changes, hot weather, pregnancy, or taking certain types of birth control pills. Oily skin is most common among teenagers. Keep your skin clean. Hot soapy water is even better.
Ivory soap is a more drying soap than many others.
Scrub the skin with soap and water. Some people put mud masks on to remove oil. Fortunately, oily skin tends to age better than dry skin, producing less wrinkles. So count yourself fortunate in one way. God cares for our necessities, and His love and grace are continually flowing, to satisfy our needs.