 Hi, I am Dr. Sachit Abraham, Consultant Dematologist at Manipal Hospital in Bangalore. Some adults have, usually, acne comes and goes till at 25 plus or minus 2 or 3 years. If it comes beyond 25 years, especially in ladies, we will have to rule out certain hormonal disturbances like polycystic ovaries or some period problems. These are things that can cause acne. In addition, certain people who have certain medications like steroids or anti-epileptics or certain oral contraceptives, they have a tendency to aggravate acne. So these are the reasons we will have to search and look why an adult is getting acne.