Underarm whitening in Singapore start with the cause, then treat the colour

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Why underarms turn dark

Underarm skin is thin, warm, often damp and rubbed every time you move your arms. That makes it quick to react, and when skin is irritated again and again it can leave behind extra pigment, called post-inflammatory hyperpigmentation. It is rarely about hygiene.

The darkening can look evenly brown, patchy, greyish from hair just under the surface, or slightly thickened. These usually have different causes:

• Shaving and plucking: razor bumps, small cuts and repeated irritation can leave pigment over time. Plucking tends to be harsher on the skin than shaving.
• Friction: tight sleeves, bra straps and skin rubbing against skin, made worse by heat and sweat.
• Deodorant and fragrance reactions: some people react to scented or harsh products, and each reaction can add colour.
• Hair shadow: dark stubble below the surface shows as a grey cast. It is not pigment in the skin, and it fades once hair is reduced.
• Hormonal change: pregnancy and other hormonal shifts can darken underarm and intimate skin.
• Acanthosis nigricans: velvety, thicker, darker skin in folds such as the underarms and back of the neck, often associated with insulin resistance and higher body weight.

See a doctor first

When dark underarms are a health question, not a cosmetic one

Acanthosis nigricans looks like dark, velvety patches in skin folds. A review in the Journal of Cosmetic Dermatology describes its link with insulin resistance, and notes that management starts with weight reduction and treating any underlying cause (Das et al., 2020). Brightening products and facials will not fix the thickening, and treating the colour alone can delay a useful health check.

See a doctor before any whitening treatment if any of the following apply. Dr Sin Yong at IN Eternity Clinic can arrange simple checks and advise on medical options.

• The skin feels velvety, rough or thicker than the skin around it.
• Similar dark patches appear on the back of the neck, the groin or under the breasts.
• The darkening appeared or spread quickly.
• You have recently gained weight, have a family history of diabetes, or have symptoms such as excess thirst or tiredness.
• Only one side is affected, or there is a lump, soreness or a rash.

At home

What whitening creams can and cannot do

Over-the-counter brightening creams can help flat, friction-related darkening a little, slowly. Most work by reducing the activity of tyrosinase, the enzyme skin uses to make melanin, so they slow new pigment rather than erase what is there. Expect weeks, not days, and only if the irritation behind the darkening has also stopped.

A 2025 systematic review of underarm darkening found only ten studies. Several topical agents reduced pigmentation to varying degrees, but there is no standard treatment (Vahabi et al., 2025). That is an honest frame for any cream or treatment.

• Creams can: gradually even out mild pigment, support results between professional sessions, and help keep colour from creeping back.
• Creams cannot: remove hair shadow, change velvety acanthosis nigricans, or keep up if you are still shaving with a blunt razor or wearing tight, rubbing sleeves.
• Be careful with scrubs, strong acids and heavily fragranced products on underarm skin. Irritation there can add the very pigment you are trying to clear.
• Give one product a fair trial before adding another. Layering several actives on thin skin is a common reason underarms get worse.

At SkinRev Lab

SKINPINK: in-centre brightening for underarms

SKINPINK is SkinRev Lab's topical brightening protocol for the underarms, inner thighs, intimate area and areola. There are no needles, lasers or energy devices involved. After a cleanse, an Aesthetic Specialist applies a brightening complex with kojic acid, glutathione, 4-n-butylresorcinol (Rucinol), retinol, bisabolol and genistein, massages it in, leaves it for a set time, then rinses, neutralises and finishes with a barrier cream.

Sessions take about 30 to 60 minutes, in a private room at CityLink Mall. Most clients go back to normal activities straight after, and any mild redness usually settles quickly. A course is planned at your assessment, with sessions usually 7 to 10 days apart, then maintenance every 3 to 6 months if you want to hold the result. Individual results vary.

SKINPINK suits women and men with flat darkening from friction, shaving, waxing or hormonal change. It is not designed for velvety thickening, which needs a doctor, and it is not hair removal.

• Avoid shaving, waxing or laser hair removal on the area for at least 3 days before each session, so the skin is intact.
• Use sun protection on any treated skin that is exposed.
• Tell your Aesthetic Specialist about any recent irritation, cuts or rashes in the area; the session may be moved.

Prices

What underarm whitening costs

SkinRev Lab prices are per session. SKINPINK is before GST; waxing is shown GST included. Medical treatments at IN Eternity Clinic are priced at consultation by the clinic, after Dr Sin Yong has confirmed the cause.

Hair removal

Shaving, plucking, waxing or laser: the effect on dark underarms

Because hair removal is one of the main triggers, the way you remove underarm hair matters as much as the brightening you choose.

Shaving does not create pigment by itself, but nicks, razor bumps and daily scraping add irritation, and stubble under the skin keeps a grey shadow. Plucking pulls on the follicle and tends to be harsher. Waxing removes hair from the root, so there is no stubble shadow and regrowth is slower and finer, usually every 4 to 6 weeks; like any hair removal it can still irritate, and ingrown hairs are possible without aftercare.

For people who want to stop removing underarm hair so often, laser hair removal reduces hair over the long term. At IN Eternity Clinic it is performed by Dr Sin Yong on the Lutronic Clarity II, which has two wavelengths, 755 nm and 1064 nm, chosen to suit your skin tone. SkinRev Lab does not offer laser hair removal or IPL.

• If you shave: use a sharp razor and a gentle gel, shave in the direction of hair growth and moisturise afterwards.
• If you wax: let hair reach about 5 mm, skip hot showers, sauna, pool and gym for 24 hours, and start gentle exfoliation again after three days.
• Space any hair removal at least 3 days before a SKINPINK session.

IN Eternity Clinic

Laser for stubborn underarm darkening

Laser is a medical treatment. It is considered once irritation and friction have been dealt with and the darkening persists. It is performed by Dr Sin Yong at IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, beside Orchard MRT, and priced at consultation by the clinic. SkinRev Lab can pass your enquiry on, or you can WhatsApp the clinic on +65 8815 3008.

Underarm skin is thin and reacts quickly, so people with darker skin, or a history of marks after shaving cuts, should expect a slower, gentler plan.

• Laser toning: low-energy 1064 nm Q-switched Nd:YAG passes that gradually break down excess melanin. It is the laser most studied for this area, used with conservative settings and spaced sessions.
• Pico laser (T2 Frax Radiance): picosecond pulses fragment pigment with less heat, used for stubborn darkening once irritation and friction have been addressed.

Visiting

Getting an assessment at CityLink Mall

SkinRev Lab is at #B1-28 CityLink Mall, 1 Raffles Link, Singapore 039393, in the underground link between City Hall MRT (EW13/NS25) and Esplanade MRT (CC3). We are open daily, 11am to 8pm. WhatsApp +65 8266 9585 to book.

At the first visit your Aesthetic Specialist looks at the skin, asks how you remove hair and which products you use, and tells you plainly if the darkening looks like something the doctor should see first. If SKINPINK suits you, the course is set out before you commit.

Sources

References & sources

1. Vahabi SM, Sajjadi S, Kalantari Y, Pourgholi E, Heidari S, Etesami I. Axillary hyperpigmentation treatment: a systematic review of the literature. J Cosmet Dermatol. 2025;24(8):e70418. PMID 40843925.
2. Das A, Datta D, Kassir M, et al. Acanthosis nigricans: a review. J Cosmet Dermatol. 2020;19(8):1857-1865. PMID 32516476.

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