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One of the most commonly suggested essential oils for acne is tea tree (Melaleuca alternifolia). The Medical Journal of Australia published a study that found a gel containing 5% tea tree oil treated acne as effectively as a lotion containing 5% benzoyl peroxide (a standard medical treatment), with far fewer side effects.

Most people can dab a little tea tree oil directly onto pimples, unless you have sensitive skin. If you have never used tea tree, spot test first to make sure you don't have a bad reaction. You can also dilute the essential oil in a carrier oil—a 5% dilution is 5 drops tea tree in 1 teaspoon carrier oil.
Here's an intensive way to deal with acne from Aromatherapy: A Complete Guide to the Healing Art:
Although tea tree is generally considered the best essential oil for acne, other acne-relieving essential oils include lavender, german chamomile, geranium, and sandalwood. Try them if you have sensitive skin and tea tree oil alone is too strong for you.
If you have dry skin, the following essential oils for acne may work best:
The following essential oil recipes give you some options for dealing with acne.
Combine ingredients in a 2-ounce glass dropper bottle. Cap and shake well.
To use: Shake. Apply 3 to 4 drops to your face. Wait for 5 to 10 minutes and then use a tissue to blot off surplus oil. Do not get in eyes.
Combine the evening primrose and essential oils in a 2-ounce glass dropper bottle. Fill bottle with kukui nut oil. Cap and shake well.
To use: Shake. Apply 3 to 4 drops to your face. Wait for 5 to 10 minutes and then use a tissue to blot off surplus oil. Do not get in eyes.
Source: The Complete Aromatherapy & Essential Oils Handbook for Everyday Wellness
From Healing With Aromatherapy:
Apply to your skin morning and night.
For a simple tea tree toner:
Source: EcoBeauty: Scrubs, Rubs, Masks, and Bath Bombs
Source: Massage & Aromatherapy: Simple Techniques to Use at Home
Combine all ingredients in an 8-ounce glass bottle. Close bottle and shake well. Store in a cool, dark place.
To use: Pour a little on a damp cotton ball and dab on face.
Source: The Complete Aromatherapy & Essential Oils Handbook for Everyday Wellness
Hydrosols are a by-product of the steam distillation of essential oils and are gentler than the oils, making hydrosols a good option for people with very sensitive skin.
For toner for skin with acne, The Essential Guide to Natural Skin Care suggests:
Blend hydrosols in a small, dark spray bottle. Lightly mist face.
It's OK to keep this toner on the bathroom counter, away from direct sunlight, for one to two months. Otherwise, store the toner in the refrigerator.

Before applying a mask, wash your skin with warm water and pat dry. Don't use a mask too often (once a week max) or you may make the acne worse. Always spot test a mask before using it on a large area to make sure you don't have an adverse reaction.
An acne face mask can be as simple as combining tea tree essential oil with one ingredient. For example, make a mask by blending 1 to 2 drops tea tree with one of the following:
Tea tree oil is the active ingredient, so you can combine it with any carrier that's safe to put on your face.
"Clay masks are great for acne prone oily skin as the clay draws out the impurities from deep in the pores," according to dermatologist Dr. Michele Green in a Bustle article. A clay mask will help active breakouts heal faster.
Here's a mask recipe from Healing With Aromatherapy:
Source: The Big Book Of Essential Oil Recipes For Beauty
Here's a mask without tea tree:
Source: The Complete Aromatherapy & Essential Oils Handbook for Everyday Wellness

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