Niacinamide, AHA, And Licorice Extract: Powerful Ingredients For Underarm Pigmentation
Dark underarms are one of the most common skin concerns, yet rarely spoken about openly. Whether it appears as dark patches, uneven tone, or rough texture, underarm pigmentation can quietly affect your confidence.
The good news? Skincare science has come a long way, and the answers are simpler than you might think. Niacinamide, AHA, and licorice extract are three research-backed actives proven to effectively tackle this concern. Each ingredient targets pigmentation differently, and together they deliver results that neither can achieve alone.
Here is what each one does and how to use them correctly.
What Causes Underarm Pigmentation?
To treat a skin concern well, you first need to understand what is causing it. Underarm darkening is almost always linked to excess melanin production, the same pigment responsible for your overall skin tone.
Several common habits trigger this response:
Repeated friction from clothing or skin-on-skin contact
Shaving or waxing, which causes micro-irritation over time
Sweat and product buildup that clog pores and lead to inflammation
Harsh deodorants containing alcohol or heavy fragrances
Post-inflammatory hyperpigmentation from ingrown hairs
The underarm skin is also thinner and more sensitive than other areas, which makes it react more strongly to these triggers. The result is a gradual darkening that requires consistent, targeted care to reverse.
Why Niacinamide Works For Underarm Hyperpigmentation
Niacinamide, a form of Vitamin B3, is one of the most well-tolerated brightening ingredients in skincare today. It works by blocking the transfer of melanin to the skin's surface, which visibly reduces dark spots and uneven tone. For underarm hyperpigmentation specifically, this is particularly effective because the darkening tends to diffuse and spread rather than concentrate in one spot.
Beyond brightening, niacinamide also:
Strengthens the skin barrier, reducing irritation caused by shaving or friction
Regulates sebum and keeps the skin balanced
Calms redness and inflammation that often accompany darkening
Improves overall skin texture with continued use
Its gentle nature makes it suitable for daily use, even on sensitive underarm skin. It also combines well with other actives without causing instability, making it an ideal base ingredient in any targeted underarm formula.
How AHA Exfoliation Addresses Underarm Hyperpigmentation
Alpha Hydroxy Acids, or AHAs, are chemical exfoliants that dissolve the bonds between dead skin cells, allowing fresher, brighter skin to surface. This step is essential for treating underarm hyperpigmentation because dark patches are often reinforced by layers of dead skin that accumulate from sweat, friction, and product residue sitting on the skin.
The two most commonly used AHAs for underarm care are:
Glycolic Acid: The smallest AHA molecule, which means it penetrates the skin efficiently and accelerates cell turnover. A 7% concentration delivers meaningful exfoliation while staying gentle enough for regular use on the delicate underarm area.
Lactic Acid: A milder AHA derived from milk. It exfoliates more gently than glycolic acid and doubles as a humectant, drawing moisture into the skin. At around 3%, it smooths texture and complements glycolic acid without stripping the skin.
Used together, these two AHAs create a layered exfoliation effect that clears buildup, promotes an even tone, and supports natural ceramide production to strengthen the skin barrier.
What Licorice Extract Does For Dark Underarms
Licorice root extract, sourced from Glycyrrhiza Glabra, is a plant-based brightening agent with a strong track record in both traditional and modern skincare. Its key active compound, glabridin, works by inhibiting tyrosinase, the enzyme that triggers melanin production. This makes it a targeted depigmenting agent, not just a surface-level brightener.
For the underarms specifically, licorice extract offers:
Gentle melanin inhibition without the irritation linked to stronger actives
Anti-inflammatory properties that calm skin sensitised by shaving or deodorant use
A naturally derived alternative to harsher bleaching agents
It works especially well alongside AHAs. While acids remove existing surface pigmentation through exfoliation, licorice extract works at the source by slowing down new pigmentation from forming. When used together, these ingredients treat both existing pigmentation and new melanin production for more complete and visible results.
When to Expect Results and How to Use These Ingredients
Treating underarm hyperpigmentation requires patience and consistency.
Here is a realistic timeline to keep in mind:
Weeks 1 to 2: Skin texture begins to smooth and feels noticeably less rough
Weeks 2 to 4: Tone starts to even out as surface pigmentation fades
Weeks 4 to 8: Deeper discolouration visibly lightens with continued use
Apply your product to clean, dry underarms and let it absorb fully before dressing. If you are using an AHA-based formula, start with once daily and gradually move to twice daily as your skin adjusts. Always wait a few hours after shaving before applying, as freshly sensitised skin is more prone to irritation.
When combined with consistent use, the right formulation can make a noticeable difference.
Why Choose Asaya for Underarm Hyperpigmentation?
When it comes to treating underarm hyperpigmentation, using the right products at every step of your routine makes a significant difference. Our range is built around clinically backed ingredients, including niacinamide, AHAs, licorice extract, and our proprietary MelaMe™ Complex, developed over two years of research to target stubborn pigmentation from the root.
Here is how our products work together to deliver visible, lasting results:
Even Tone Underarm Mist
It combines 7% Glycolic Acid, 3% Lactic Acid, Niacinamide, and Licorice Extract for targeted underarm care. Alcohol-free, residue-free, and dermatologically tested, with visible results in two weeks. Also features SymDeo® B125 for up to 48 hours of odour control.
Advanced Spot Targeting Serum
It is powered by MelaMe™ Complex, which fades dark spots and supports barrier repair across the body, including underarms.
Even Evermore Creme
It hydrates while actively treating dark spots, making it an effective daily addition to any depigmentation routine.
Tone Restore Knee-Neck-Elbow Cream
It gently fades stubborn patches on body areas prone to darkening, including underarms.
Head to Toe Anti-Pigmentation Set
It offers a complete, structured depigmentation routine in one go. Explore the full collection and find what works best for your skin.
Frequently Asked Questions
Can I use AHAs on my underarms every day?
Yes, once your skin has adjusted. Begin with once-daily use, and gradually increase as your skin becomes more comfortable. Reduce frequency if you notice any irritation.
How long does niacinamide take to lighten dark underarms?
With regular and consistent use, most people begin to see noticeable improvements in tone within two to four weeks.
Is licorice extract safe for sensitive skin?
Yes. It is one of the gentlest brightening ingredients available and is well-tolerated by all skin types.
Can I apply these ingredients right after shaving?
It is best to wait a few hours after shaving before using any AHA-based product, as freshly shaved skin is more sensitive and prone to irritation.
Do I still need a separate deodorant if I use an AHA underarm mist?
Not necessarily. A formula with a clinically tested deodorant active like SymDeo® B125 provides effective odour control on its own, so a separate deodorant is not required.
