Armpit discoloration and darkening: Causes and solutions

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Discoloration is when you notice a change in the normal color of your underarms. Dark underarms happen when the skin becomes darker than the surrounding skin, often because of hyperpigmentation (an increase in melanin production). These changes are not unusual and affect many men of all skin types. While usually a cosmetic concern, it can be linked to everyday factors like friction, irritation, or, in some cases, underlying skin conditions. Understanding what’s causing the change is the first step toward improving the look of your underarm skin.

Dove Men + Care provides this guide to help you understand and manage underarm discoloration and darkening.

Why do underarms go dark?

The skin under your arms is sensitive and often subjected to irritation. Here are some of the most common causes of dark underarms:

Shaving and hair removal

If you shave or remove the hair under your arms, this can irritate the delicate skin and lead to post-inflammatory hyperpigmentation (pigmentation triggered by inflammation or injury). Using a sharp razor and a lubricating shaving gel can help minimize irritation.

Friction from clothing

Tight clothing or constant arm movement can cause friction, thickening, and darkening of the skin over time. It’s best to wear loose, breathable fabrics to reduce friction.

Product Ingredients

Some deodorants contain alcohol or fragrances that may irritate the skin. Switching to fragrance-free, alcohol-free, and moisturizing options can help. "Most modern antiperspirants and deodorants are formulated to be safe for daily use,” explains Unilever R&D scientist Matt Annecharico. “That said, there are some products that can be harsher than others. If a product causes irritation, this can lead to discoloration and uneven skin tone."

Sweating

Sweating is your body’s built-in cooling system, but it can also sometimes cause issues. "Sweat can cause irritation, so reducing sweat by using an antiperspirant can help mitigate potential underarm darkening due to irritation," says Unilever R&D manager Bivash Dasgupta. If you struggle with heavy sweating, choose a strong antiperspirant that’s preferably dermatologist-tested and monitor your skin to see how it responds.

How skin type and genetics influence underarm darkening

Genetics and natural skin tone both affect how visible underarm discoloration appears. Darker skin types are more prone to post-inflammatory hyperpigmentation. Understanding your skin type can help you choose gentler grooming habits and set realistic expectations for how long improvement may take.

How to remove dark marks from underarms

Addressing dark underarms involves a combination of good skincare practices and the right products. Here's a straightforward routine to help you get started:

Gentle cleansing

Use a mild cleanser that won’t strip your skin. A hydrating product helps remove sweat and buildup while supporting your skin’s moisture barrier.

Proper shaving techniques

Shave your underarms after showering when the hair is soft. Apply a hydrating shaving gel, use a clean razor, and rinse thoroughly to reduce irritation that can lead to dark marks.

Exfoliation

Gently exfoliate two to three times a week to remove dead skin cells. This helps promote a more even-looking skin tone.

The right antiperspirant

Go for formulas that are kind to the skin, as these options can help protect against sweat and odor while reducing the risk of irritation. Always patch-test new products.

When to see a professional about dark underarms

Underarm darkening is usually a response to irritation. By understanding the causes and changing your routine slightly, you can manage underarm discoloration and darkening effectively. Choosing gentler products, reducing friction, and avoiding known irritants can help calm the skin and keep your underarms smooth, healthy, and resilient.

If you’ve tried these approaches and the dark patches are still lingering, it may be worth getting a professional opinion. "Any persistent pigmentation changes should trigger a conversation with a dermatologist,” Annecharicoadvises. “Remember, not all dark spots can be corrected. If discoloration has shown no signs of improvement after a proper skincare regimen, it’s best to reach out to a dermatologist to diagnose your unique situation.”

FAQs

Can deodorant cause armpit darkening?

Yes, deodorants with alcohol or fragrance may irritate sensitive skin, which can lead to pigmentation changes and discoloration of your armpits.

How long does it take to see improvement?

Noticeable changes typically appear within two to four weeks, though deeper pigmentation may take longer or need professional care.

Can sweat cause underarm darkening?

Not directly, but sweat combined with friction, tight clothing, or harsh products can irritate the skin. Over time, this irritation may contribute to discoloration in some people.

When should I see a dermatologist for dark underarms?

If discoloration lingers even after changing products and improving your grooming routine, or if your skin becomes thickened, itchy, or rapidly darker, it’s best to get it checked by a dermatologist to rule out underlying conditions.

This story was produced by Dove Men + Care and reviewed and distributed by Stacker.