Old Spice deodorants and body washes contain several ingredients known to trigger skin reactions, from mild redness to painful chemical burns. The most likely culprits are fragrance compounds, propylene glycol, and (in some formulations) baking soda. Your rash is almost certainly a form of contact dermatitis, meaning your skin is reacting to one or more of these chemicals on direct contact.
The Ingredients Most Likely Causing Your Rash
Fragrance is the single most prevalent allergen in deodorant products. Old Spice is known for strong, distinctive scents, and those scents come from complex chemical blends that can irritate sensitive skin. Even if you’ve used fragranced products your whole life, you can develop a sensitivity at any point.
Propylene glycol is another common trigger. It’s a synthetic alcohol used in deodorants to give them a smooth, firm texture and help them glide onto skin. About 38% of personal care products contain it, and it’s one of the most frequently identified causes of both allergic and irritant contact dermatitis. What makes propylene glycol tricky is that reactions to it are often mild or “weak,” which means you might tolerate it in small amounts (like in a moisturizer) but react when it sits in a warm, enclosed area like your armpit for hours.
Baking soda (sodium bicarbonate) appears in some Old Spice formulations and is a well-known skin irritant. It’s highly alkaline, and your underarm skin is naturally slightly acidic. That pH mismatch can break down your skin’s protective barrier over time, leading to redness, peeling, or a burning sensation. Other potential irritants include essential oils, parabens, and lanolin.
Irritant vs. Allergic Reactions
There are two different mechanisms that could be at work, and they feel slightly different. Irritant contact dermatitis happens when a chemical directly damages skin cells. It can affect anyone if the concentration is high enough or the exposure long enough. This type of reaction typically shows up as redness, burning, or a raw feeling, sometimes within hours of application.
Allergic contact dermatitis is an immune response. Your body has identified a specific ingredient as a threat, and each time you’re exposed, your immune system overreacts. This type can cause itching, blistering, and swelling, and it sometimes takes 24 to 72 hours to appear. Once you’re sensitized to an ingredient, even tiny amounts can set off a reaction, and the sensitivity usually lasts for life.
With propylene glycol specifically, the line between these two types is blurry. Dermatologists note that distinguishing true allergic reactions from irritant reactions to propylene glycol is genuinely challenging, even with clinical patch testing.
Why Your Armpits Are Especially Vulnerable
Underarm skin is thinner than skin on most of your body. It stays warm and moist throughout the day, which increases absorption of whatever you put on it. Shaving creates micro-cuts that let irritants penetrate deeper. And because your armpits stay folded against your body, the product sits in sustained contact with your skin for hours with no air circulation. All of this means your armpits react to ingredients that your hands or arms might tolerate without issue.
You’re Not the Only One
Old Spice has faced lawsuits from consumers who reported painful rashes, chemical burns, and skin lesions after using both their deodorant and body wash products. The complaints have come from men, women, and children. Procter & Gamble, the company behind Old Spice, has denied that the products pose a meaningful health risk and has contested the claims in court. Regardless of the legal outcome, the volume of complaints suggests the formulations are more reactive for some people’s skin than typical deodorants.
How to Clear Up the Rash
Stop using the product immediately. That sounds obvious, but many people try to push through a mild rash, and repeated exposure can worsen a reaction significantly. Wash the area gently with a fragrance-free soap and lukewarm water.
For itching and inflammation, an over-the-counter hydrocortisone cream (1%) applied thinly to the area can help. Oral antihistamines can reduce itchiness if the rash is widespread or keeping you up at night. Anti-chafing powders can keep the area dry while it heals. Most irritant reactions clear within a few days to a week once you remove the trigger. Allergic reactions can take longer, sometimes up to two or three weeks if the reaction was severe. If you’re seeing blistering, oozing, or the rash is spreading or not improving after a week, a doctor can prescribe a stronger corticosteroid cream.
Switching to a Safer Deodorant
Finding a replacement means figuring out which ingredient caused your reaction. If you suspect fragrance, look for “fragrance-free” products (not “unscented,” which can still contain masking fragrances). If baking soda is the culprit, check ingredient lists for “sodium bicarbonate” and avoid it. If propylene glycol is the problem, you’ll need to read labels carefully since it appears in a huge range of personal care products.
Several brands specifically formulate for reactive skin. Native offers a “Sensitive” line that removes baking soda from their standard formula, though you should still check individual product labels. Lume is designed for sensitive skin and uses a different odor-fighting approach. Little Seed Farm, Ethique, and Wild all offer baking soda-free options. If you try a new deodorant, test it on a small patch of inner arm skin for a few days before committing to full underarm use.
Beyond Traditional Deodorant
Some people with reactive skin skip conventional deodorant entirely and manage odor through other methods. Glycolic acid wipes (around 20% concentration) kill odor-causing bacteria and exfoliate skin, and many users report all-day effectiveness. Washing armpits with an antibacterial soap is another low-irritation approach. Crystal salt sticks made from potassium mineral salt are a minimalist option, though it’s worth knowing these contain a form of aluminum salt if you’re trying to avoid aluminum entirely.
One practical distinction matters here: deodorants mask or prevent odor, while antiperspirants reduce sweating. They’re regulated differently in the U.S., with antiperspirants classified as drugs and deodorants as cosmetics. If your main concern is odor rather than sweat, a simple bacteria-killing approach like glycolic acid or antibacterial soap may work better than any stick or spray, with far fewer ingredients to react to.