Acne is a common problem of your age and occurs due to blockage of oil glands in the skin and is under hormonal influence. Certain factors which may aggravate pimples are stress, oil based occlusive cosmetics and food items like milk and other dairy products. Pimples usually leave behind spots and chances of dark spots increase if you fiddle with them.For acne, open pores and dark circle treatment visit a qualified dermatologist as it's takes some months treatment for results to show and treatment depends on your acne severity and skin type. Continue cetaphil cleanser. You haven't specified which moisturiser you are using. Many times moisturisers worsen acne. Use a non comedogenic moisturiser if you are not using already.
Hope this helps you. Best regards, Dr Pinanky Jadhav Eternis clinic, Pune