A condition called seborrheic dermatitis or SD may cause skin to be oily and irritated especially on the face and scalp. People with SD produce an overabundance of the natural skin oil called sebum, reports the American Osteopathic College of Dermatology or AOCD. Hormonal imbalances, stress, hot weather and other factors may also result in an oily scalp. Certain shampoos and scalp treatments may help relieve the symptoms of an oily scalp.
Shampoos
Washing your hair every day with a gentle shampoo may decrease oiliness in the scalp and guard against dandruff, according to the MayoClinic.com. Using a shampoo that contains tea tree oil may benefit an oily scalp because of its antiseptic, antibiotic and antifungal properties.
In stubborn cases over-the-counter medicated shampoos that contain, selenium sulfide, tar, zinc pyrithione salicylic acid or the anti-fungal agent ketoconazole may be needed to diminish scalp fungi. Your doctor may recommend prescription-strength ketoconazole if other shampoos have been unsuccessful.
Massaging the scalp between shampoos also may force out a modest amount of oil (See Reference 2).
Witch Hazel and Mouthwash
A homemade scalp treatment consisting of equal amounts of witch hazel and mouthwash such as Listerine may minimize oil secretion. The mouthwash serves as an antiseptic while the witch hazel works as an astringent, according to Mother Nature.com. Do not apply a mouthwash to areas where skin is broken since it can cause irritation. Dip cotton pads into the blend and apply to your scalp each time you shampoo.
Apple Cider Vinegar, Lemon and Eucalyptus Oil
An apple cider vinegar scalp treatment will destroy bacteria that blocks pores and emits oil into the scalp, notes Health911.com. Apply 2 tbsp. of cider vinegar to the scalp and allow it to sit for up to three hours. Shampoo and rinse thoroughly. Pure lemon juice may also be used.
Eucalyptus oil may benefit an oily scalp because it helps control the rate of oil production, according to Home Remedies.
Styling Considerations
You can help treat an oily scalp simply by cutting back on the use of hair styling products. Sprays, waxes, gels and mousses can accumulate on your hair and scalp and increase oiliness, notes the MayoClinic.com.


