Acne is multifactorial in occurance.Riisk factors for developing acne include Hormonal changes, certain medications, such as corticosteroids, a diet high in refined sugars or carbohydrates, such as bread and chips and genetics. U have to find out what's the exact reason why u have recurrent acne. Marks can b taken care of with basic medication. They normally occur if u have a habit of picking or squeezing them. When the get traumatised they end up leaving marks. Consult with a Dermatologist with relevant pictures for further evaluation.