As much as I like to see natural therapies and natural Dermatology is making more headway than traditional Dermatology; aromatherapy will do very little in acne treatment. Acne is caused by excessive Sebum production with the greater percentage coming from hormonal imbalance. https://medium.com/@emmaryall/acne-causes-treatment-and-how-to-minimise-the-chance-of-acne-breakout-e4ed1ec3a43a#.sv76fpklk
Acne is a major issue to many people and creates a great deal of depression. Essential oils rubbed into the skin if not properly cleansed will further clog exacerbating the already blocked channels creating, even more, congestion.
A natural approach to combatting acne has to be thought of balancing the bodies hormonal and dietary system. Aromatherapy may have wellness benefits despite caution should be practised when rubbing heavy oils into the dermis.