Essential oil drops can be used in the emulsion. Essential oils are not oily. If it is oily, it is likely to be a synthetic or compound essential oil.
Tea tree essential oil and lavender essential oil, because they are pure plant extracts, will not be effective quickly if they are used for acne removal. They have a natural law, slowly adjust your skin.
It can be added to some acne cream. Can enhance the acne removing effect.