Irritated Armpits: Common Causes and How to Prevent Them 2025 Guide

The skin of the armpits is one of the most delicate on the body. Thin, with folds, and constantly exposed to moisture and friction, it can react with redness, burning, itching, or flaking due to various factors. Knowing the most common causes of irritation is the first step to preventing it and keeping this area healthy.

1. Frequent Shaving

Shaving removes hair, but also a thin layer of skin, leaving the area more exposed and sensitive. This creates miniature wounds that are not visible to the naked eye. Using dull blades, shaving dry, or not moisturizing afterward can worsen irritation. 

2. Aluminum in Antiperspirants

Aluminum compounds (like aluminum chlorohydrate) temporarily block sweat glands. While they reduce sweating, they can alter pH and cause sensitivity in reactive skin.

3. Propylene Glycol: Ubiquitous Allergen

This synthetic ingredient, used as a solvent and humectant in many cosmetics, was named the allergen of the year by the North American Contact Dermatitis Society. It can cause allergic reactions, especially in sensitive skin. It is the main ingredient in gel deodorants.

4. Alcohol

Present in some deodorants and antiperspirants, fast-evaporating alcohol dries out the skin and can cause burning, especially after shaving.

5. Baking Soda and Magnesium Hydroxide

These ingredients, common in natural deodorants, are highly alkaline. By raising the skin's pH, they can unbalance the microbiota and cause redness or flaking. It's important to remember that healthy human skin is acidic and that women's skin pH is slightly more acidic.

6. Alum Stone

Although considered "natural," alum stone is composed of aluminum salts. When dissolved by moisture, it releases aluminum which can cause reactions similar to those of conventional antiperspirants.

7. Fragrances and Essential Oils

Some artificial perfumes and fragrances contain allergenic or sensitizing compounds, capable of causing dermatitis in the area. Also, natural deodorants often contain very high amounts of essential oils.

8. Other Factors to Consider

• Tight or synthetic clothing that prevents ventilation.

• Excessive sweating that keeps the skin moist for prolonged periods.

• Harsh soaps or detergents that alter the natural acid mantle.

How to care for sensitive armpits

Opting for a natural, aluminum-free, fragrance-free, and free of alkaline or irritating ingredients deodorant is key for delicate skin. Maintaining good hygiene, moisturizing the area, and spacing out shaving also helps prevent irritation. In more severe cases, consult your doctor.