2 As we mentioned above, essential oils are a common allergen, but they can also irritate skin that’s already been broken or cut from shaving. ![]() Allergic contact dermatitis occurs when your skin comes into direct contact with something you’re allergic to, while irritant contact dermatitis results from a damaged skin barrier. There are two types of contact dermatitis. One of the telltale signs of contact dermatitis is that the reaction will tend to be exactly in the pattern of application of the deodorant, Dr. Skelsey says, adding that any of the ingredients mentioned above-and countless others-can trigger this reaction. If you get an armpit rash from deodorant, it’s most likely a case of contact dermatitis, Dr. What types of skin reactions should you watch for? Other irritants or allergens can largely be found under the essential oil umbrella, such as limonene which can be found in rosemary extract, as well as lemongrass, lavender, tea tree, sandalwood, and peppermint oils, which are less likely to cause a deodorant rash but can still be culprits. Alexiades says vitamin E is a common ingredient that can irritate the skin or set off an allergic reaction. Other things to watch for on the label? Dr. Due to baking soda’s well-known reputation as a potential irritant, some natural deodorant brands now offer baking-soda-free products for sensitive skin. Its alkaline nature, which is more basic than the skin’s natural pH, can easily prompt a skin reaction, Neelam Vashi, MD, associate professor of dermatology at Boston University School of Medicine and director of the Boston University Cosmetic and Laser Center at Boston Medical Center, tells SELF. Natural deodorants often contain baking soda, or sodium bicarbonate, to help neutralize body odor. Natural deodorants are often made with common irritants that can cause an armpit rash. ![]() 1 Another perk? “AHAs can lower the armpits’ pH levels, making the environment less hospitable to bacteria responsible for the odor,” Dr. Other ingredients you might find include alpha hydroxy acids (AHAs), which are chemical exfoliators, like glycolic or lactic acids, that help dissolve dead skin cells. The latter boasts antibacterial benefits, she adds. Arrowroot powder and charcoal are also formulated in some natural deodorants to help absorb moisture, Hadley King, MD, clinical instructor of dermatology at the Weill Medical College of Cornell University, tells SELF. ![]() For instance, tea tree oil, which is known for its antibacterial properties, per the Mayo Clinic, is often included, while other essential oils derived from bergamot or rosemary provide fragrance. Look at natural deodorants in more detail and you’ll also find that many formulas are free from phthalates, parabens, or talc, while underscoring plant-derived ingredients that target various underarm concerns.
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