The 5 Skincare Mistakes I See Most Often as an Aesthetic Doctor

In my years of practice as an aesthetic doctor in Singapore, I have seen patients spend significant time and money on skincare — only to sabotage their own results without realising it. The mistakes I am about to share are not rare; they are the norm. And the good news is that they are all fixable.

Here are the five skincare mistakes I encounter most frequently, and what I actually recommend instead.

Mistake 1: Over-Exfoliating

This is, without question, the mistake I see most often. Patients arrive at my clinic with red, sensitive, reactive skin — and almost universally, they are exfoliating too frequently. The belief that more exfoliation means more cell turnover and better skin is deeply ingrained, but the science says otherwise.

The skin barrier — the stratum corneum — is not just dead debris to be scrubbed away. It is a functional system of lipids and proteins that protects against infection, moisture loss, and environmental aggressors. A review by Elias (2008, Current Allergy and Asthma Reports) clarified that barrier dysfunction caused by over-stripping the skin is a primary driver of sensitisation, reactive conditions, and paradoxically, increased pigmentation in darker skin types.

The fix: exfoliate no more than two to three times per week, and choose gentle chemical or enzymatic exfoliation over physical scrubs. The FRUIT ENZYME Refining & Renewing Serum from SW1 Shop uses gentle enzymatic exfoliation — it removes dead cells and refines texture without destabilising the barrier. When the barrier is already compromised, the SKIN RESCUE Clarifying & Balancing Cream is specifically formulated to calm, balance, and rebuild disrupted skin — it is what I reach for when a patient needs to pause actives and repair.

Mistake 2: Skipping SPF

I understand why this happens. Sunscreen in Singapore's climate can feel heavy and uncomfortable. Many patients tell me they skip it because they are mostly indoors, or because they find the texture intolerable. But the evidence on UV damage is unambiguous: Hughes et al. (2013, Annals of Internal Medicine) demonstrated that daily sunscreen use significantly reduced photoageing markers over a 4.5-year period compared to discretionary use.

UVA penetrates glass. It is present on cloudy days. And for Asian skin specifically, UV exposure is the primary trigger for melasma and PIH — two of the most treatment-resistant pigmentation conditions I manage.

The fix: find a formula you will actually wear every single day. For oily or combination skin, CLEAN Mineral Sunscreen SPF50 provides a matte, non-comedogenic finish that does not slide off in humidity. For normal to dry skin, NAKED Mineral Sunscreen SPF50 with hyaluronic acid delivers a dewy finish without white cast. If you want UV protection with a subtle light-diffusing and blurring effect, UMBRELLA UV-Protection & Light-Diffusing Cream doubles as a finishing step.

Mistake 3: Using Too Many Actives at Once

There is something I call "serum stacking syndrome" — the tendency to layer five or six different active serums in the hope that more is better. In practice, loading the skin with multiple high-strength actives simultaneously is a reliable way to cause irritation, increase sensitivity, and make it impossible to identify what is actually working.

Certain combinations can also neutralise each other. High-pH ingredients can interfere with low-pH actives. And some combinations — retinol with strong chemical exfoliants, for instance — significantly increase barrier disruption and photosensitivity risk.

The fix: start with one or two actives, use them consistently for at least four to six weeks, then assess. Build slowly. The Niacinamide Power Serum from SW1 Shop is an ideal first active for most Asian skin types — exceptionally well tolerated, multi-functional, and compatible with almost every other ingredient.

"Skincare is not a race. The patients who get the best results over time are those who choose two or three well-matched actives and use them consistently for months — not those who rotate through ten products every fortnight."

Dr Low Chai Ling, Aesthetic Doctor & Founder, SW1 Shop

Mistake 4: Choosing the Wrong Concentration

More is not always better — and less is not always safer. Concentration matters enormously. Retinol at 0.01% is unlikely to produce measurable results; at 1% applied nightly on untreated skin, it can cause significant irritation and peeling. The science of topical retinoids is clear: concentrations of 0.1–0.3% retinol produce meaningful improvements in fine lines, texture, and collagen density while minimising the retinisation period that higher concentrations cause.

The same principle applies across all actives. Niacinamide below 2% has minimal clinical effect; 5–10% is the relevant range. Vitamin C below 8% does little for most skin types; above 20%, tolerability drops significantly for Asian skin.

At SW1 Shop, formulations are calibrated to the evidence. The RETINOL RENEW Serum is an example of correctly-dosed retinol — formulated to deliver genuine results while managing the irritation that poorly-dosed products cause. It is the kind of clinical precision that distinguishes cosmeceutical-grade products from generic options.

Mistake 5: Ignoring the Skin Barrier

The skin barrier is the foundation of everything else. No active ingredient — no matter how well formulated — can do its job in a compromised barrier environment. And yet barrier health is the most frequently overlooked element of a routine.

Signs of a compromised barrier: skin that feels tight after cleansing, stinging when you apply serums, persistent redness, sensitivity to previously tolerated products, and a texture that looks dull or rough despite regular exfoliation.

The fix: pause the actives, simplify your routine, and focus on repair. For oily or combination skin dealing with barrier issues alongside congestion, the SUPER HELPER mattifying and detoxifying serum helps manage sebum without adding irritation to a compromised barrier. For targeted repair, the Copper Peptide Ampoule from SW1 Shop supports dermal remodelling and wound-healing pathways — copper peptides are among the most studied ingredients for skin repair and regeneration. And SKIN RESCUE is specifically designed to calm, balance, and restore barrier integrity without clogging pores.

The Common Thread

All five of these mistakes share a common cause: doing too much, too fast, without listening to what the skin is telling you. Healthy skin is quiet — it does not sting, flush, or react. The goal of a good skincare routine is to keep it that way while steadily improving what you want to improve. SW1 Shop products are formulated with that balance in mind — clinically active, but designed for real-world use and real skin.

References

• Elias PM. "Skin barrier function." Curr Allergy Asthma Rep. 2008;8(4):299–305. doi:10.1007/s11882-008-0048-0
• Hughes MC, et al. "Sunscreen and Prevention of Skin Aging." Ann Intern Med. 2013;158(11):781–790. doi:10.7326/0003-4819-158-11-201306040-00002
• Kligman AM. "Guidelines for the use of topical tretinoin for photoaged skin." J Am Acad Dermatol. 1989;21(3 Pt 2):836–859.

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