A. For severe acne, you should consult a dermatologist as there are several reasons why you may have this condition. It could be hormonal, heredity, etc., so best to get it checked before doing something by yourself. However, if it isn’t that bad, then using tea tree as an active ingredient in your mask will help you fight acne. In fact, you can simply apply a few dots of tea tree oil on the infected areas and keep it overnight. In the morning, your acne is sure to have reduced by a considerable amount.