Maskne and humidity breakouts why masks, helmets, straps and Singapore's heat set off acne, and what helps

The basics

What maskne is: acne mechanica under a mask

Maskne is the everyday name for acne that appears or flares under a face mask. Dermatologists see it as a variant of acne mechanica, a term Mills and Kligman coined in 1975 for acne made worse locally by pressure, friction, rubbing, squeezing or stretching. In their work, tight straps and belts, sports shoulder pads and the constant rubbing of a truck driver's back all provoked spots, and simply sealing acne-prone skin under adhesive for two weeks set off new inflamed spots from blocked pores too small to see.

Under a mask, several of these forces combine: the fabric rubs and presses, breath and sweat raise heat and moisture, and the skin stays covered for hours. Teo, a Singapore dermatologist, describes maskne as most likely a problem of blocked follicles driven by mechanical stress and by changes to the skin's microbiome from heat, pH and moisture, and names tropical climates and outdoor sweating as risk factors.

Maskne tends to sit in an 'O-zone' over the nose, cheeks, chin and jaw where the mask touches. That differs from the forehead-and-nose T-zone typical of teenage acne and the jawline U-zone typical of adult acne.

The evidence

Do masks really cause acne? What studies found

During the SARS outbreak in 2003, a survey of 322 healthcare workers at the National Skin Centre and Tan Tock Seng Hospital in Singapore found that 109 of the 307 who wore N95 masks regularly reported skin reactions. Acne was the commonest, reported by 59.6% of them, followed by facial itch and rash.

During COVID-19, a prospective study followed 66 people with acne or rosacea who wore masks for at least six hours a day. After six weeks, acne scores had risen in the mask-covered areas, and rosacea had worsened too. These studies are small, and the Singapore survey relied on self-report, but they match what dermatologists saw in clinic.

Masks are no longer part of daily life for most people in Singapore, but many still wear them on hazy days, when unwell, in clinics and hospitals, and at work. The same mechanism also explains breakouts under helmets, headbands and straps.

Singapore's climate

Why heat and humidity make breakouts worse

Singapore is hot and humid all year. The Meteorological Service Singapore gives a mean annual relative humidity of about 82%, rising above 90% just before sunrise and falling to around 60% in the afternoon, with daytime highs usually of 31 to 33°C. Sweat and humid air keep the skin surface damp and warm, which favours blocked pores and changes the balance of the yeasts and bacteria that live on the skin, especially under anything that traps moisture.

In a year-long study of 171 acne patients in tropical Delhi, nearly half said their acne changed with the seasons, and 40% said it worsened in summer; the flares tracked monthly temperature and humidity. That fits what many people notice here: breakouts after outdoor sport, a hot walk to the MRT or a run of humid, rainy weeks.

Air-conditioned offices can leave skin feeling tight while the commute leaves it sweaty, so a light, non-comedogenic moisturiser usually suits better than a rich cream that sits on the skin all day.

Friction points

Helmet, strap and headphone acne: where it shows and what helps

These are all acne mechanica: pressure and rubbing, plus trapped heat and sweat, inflame follicles that were already prone to block. Reducing the friction is the change that matters most, and breakouts tend to ease once the trigger changes.

Delivery riders, cyclists, gym-goers and anyone carrying a heavy bag on a hot commute are especially exposed, so match the fix to the source.

Gym and commute

Gym and commute habits that cut down sweat breakouts

None of these steps is dramatic, but in a humid city they add up. If you train outdoors or ride for work, a quick rinse and a change of clothes soon afterwards does more than an extra product.

Scrubbing sweaty skin hard does not help; friction is part of the problem, so pat dry and cleanse gently.

• Shower, or at least rinse and change, soon after exercise; do not sit in damp kit.
• Press sweat away with a clean towel rather than rubbing.
• Put a clean towel between your skin and shared mats and benches.
• Remove make-up before a workout, or skip it.
• Wash gym clothes, sports bras, caps and headbands after each use.
• On a hot commute, carry a spare mask and blot rather than scrub.
• Keep hands and phones off the face.

Skincare

Lightweight skincare for masks and humid weather

Under a mask or in humid heat, less is more. Choose a gentle cleanser, a light gel or lotion moisturiser labelled non-comedogenic, and a light sunscreen. Teo notes that chemical sunscreens are more likely to irritate or block pores under occlusion, so thick layers of anything are better kept off skin that will be covered for hours.

Acne treatments still help, but use them sparingly where a mask or strap sits. Benzoyl peroxide, salicylic acid, alpha hydroxy acids and retinoids are more likely to irritate under occlusion, so apply a thin layer at night rather than before a long masked day, and pair them with a plain moisturiser. Benzoyl peroxide can also bleach masks, towels and pillowcases.

Keep sunscreen on exposed skin and reapply outdoors. One Singapore dermatologist suggests that a UPF-rated fabric mask can stand in for sunscreen on the covered lower face.

Look-alikes

When it is not maskne: folliculitis, perioral dermatitis and others

Several conditions look like maskne but need different care, which is why the proposed definition of maskne only applies once they are ruled out. In a study of 320 people diagnosed with acne, 28.8% had Malassezia ('fungal') folliculitis on microscopy, mostly alongside ordinary acne; those with it were about seven times more likely to report itch and far more likely to have spots on the hairline and upper back.

Masks can also irritate the skin directly: in the Singapore SARS-era survey, among regular N95 users with skin reactions, facial itch (51.4%) was almost as common as acne (59.6%), and about a third had a rash (35.8%).

Doctor first

When to see a GP or dermatologist

Folliculitis that spreads or hurts, perioral dermatitis and seborrhoeic dermatitis are medical conditions, and a GP or dermatologist can diagnose and treat them. Do not stop a steroid cream abruptly without advice, as perioral dermatitis can rebound.

For ordinary maskne that persists despite these steps, a doctor may add prescription treatment, such as a topical retinoid or an antibiotic gel used with benzoyl peroxide. See a doctor if you notice any of the following.

• Bumps that are itchy and all the same size, especially on the forehead, chest or back
• A rash around the mouth or nose that burns, particularly after using a steroid cream
• Painful lumps, boils, spreading redness or a fever
• Breakouts that leave dark marks or dents
• No improvement after six to eight weeks of less friction and gentle acne care
• Deep, painful acne, or acne that is affecting your mood

Facials

Facials for maskne: what helps and what to skip

For congestion from masks and sweat, a gentle extraction facial can clear blackheads and whiteheads. At SkinRev Lab, HydraFacial Syndeo uses vortex suction rather than squeezing to lift congestion (S$288 to S$438 before GST; first-timer rate at the counter), and SKINLDM uses dual-frequency ultrasound to calm reactive, inflamed skin (S$288 before GST; first visit S$68).

Skip steam, rich masks and extraction if the rash is perioral dermatitis or folliculitis, or if you have painful, inflamed lumps; those need a doctor first. If you are taking or have recently stopped isotretinoin, exfoliating facials wait until your doctor says it is safe.

Where to go

Maskne and acne care in our network

At IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, beside Orchard MRT, Dr Sin Yong grades acne, rules out look-alikes such as fungal folliculitis and perioral dermatitis, and prescribes treatment after a consultation when appropriate. Treatment is priced at consultation by the clinic; WhatsApp +65 8815 3008.

SkinRev Lab, at CityLink Mall #B1-28, linked underground to City Hall and Esplanade MRT, does not diagnose skin conditions, prescribe or inject. Its facials can support congested or reactive skin alongside a doctor's care; WhatsApp +65 8266 9585.

Sources

References & sources

1. Mills OH, Kligman AM. Acne mechanica. Arch Dermatol. 1975;111(4):481-483.
2. Teo WL. Diagnostic and management considerations for "maskne" in the era of COVID-19. J Am Acad Dermatol. 2021;84(2):520-521.
3. Foo CC, Goon AT, Leow YH, Goh CL. Adverse skin reactions to personal protective equipment against severe acute respiratory syndrome: a descriptive study in Singapore. Contact Dermatitis. 2006;55(5):291-294.
4. Damiani G, Gironi LC, Grada A, et al. COVID-19 related masks increase severity of both acne (maskne) and rosacea (mask rosacea): multi-center, real-life, telemedical, and observational prospective study. Dermatol Ther. 2021;34(2):e14848.
5. Narang I, Sardana K, Bajpai R, Garg VK. Seasonal aggravation of acne in summers and the effect of temperature and humidity in a study in a tropical setting. J Cosmet Dermatol. 2019;18(4):1098-1104.
6. Meteorological Service Singapore. Climate of Singapore. Weather Information Portal.
7. Paichitrojjana A, Chalermchai T. The prevalence, associated factors, and clinical characterization of Malassezia folliculitis in patients clinically diagnosed with acne vulgaris. Clin Cosmet Investig Dermatol. 2022;15:2647-2654.

Common questions

Your questions,
answered