Pimples are common in your age and some people have more tendency to form dark spots or scars after pimples resolve. Best solution is to take regular treatment for pimples to control them and avoid marks formation. Existing marks can be treated with prescription based creams and peeling sessions under supervision of a qualified dermatologist.
Visit a nearby qualified dermatologist.
Do not pick at pimples to reduce chances of marks and scars. stay away from direct sunlight. cover your face when roaming outdoor. start caring for your skin from now than after the damage has happened.