Key takeaways

  • Potency and body site must match the treatment plan. Face, eyelids, folds and groin need more caution than thick skin; a percentage alone does not compare different steroid ingredients. HealthHub
  • Fading redness does not establish that an infection has cleared. A steroid can quiet the appearance while fungal infection persists or spreads. Check the active ingredients, rather than judging a cream by speed.
  • Hidden ingredients prevent informed use. HSA found betamethasone valerate, mercury and triclosan in Q-nic Care Whitening Underarm Cream, despite its harmless/natural claims. HSA alert

Steroid creams, fungal rashes and hidden ingredients

Steroid Creams, Fungal Rashes and Hidden Ingredients

A consumer reported an underarm cream to HSA because its immediate results made her suspect potent ingredients. HSA’s 25 October 2024 alert named it as Q-nic Care Whitening Underarm Cream. A product that rapidly changes skin can contain an undeclared medicine. Even a correctly labelled steroid needs its potency, site, duration and the cause of the rash checked. HSA alert

What does a topical steroid actually do?

Topical corticosteroids suppress skin inflammation, reducing redness, itch and swelling. They may be used for conditions such as eczema and some forms of dermatitis, where inflammation drives redness, itch and discomfort. The active ingredient and concentration matter, but they are not the whole potency story: formulation, body site and skin condition also affect delivery.

Clobetasol is a potent example; mometasone and betamethasone products also require their exact strength and form to be identified. A percentage cannot be compared across different ingredients as though it were a universal power scale.

Creams, ointments, lotions and scalp preparations behave differently. Ointments may be more occlusive; lotions can be practical on hairy areas. That physical difference can matter, but it does not allow a user to transfer instructions from one medicine to another.

Why does body site change the risk?

Thin skin and covered areas can absorb more topical steroid. The face, eyelids, groin and skin folds are therefore not equivalent to palms, soles or thick plaques. Children have a higher surface-area-to-body-mass ratio, which can make extensive use more consequential.

Excessive potency or duration can cause thinning, visible small blood vessels, stretch marks, acne-like eruptions and changes around the mouth. Near-eye use adds eye concerns; prolonged use over a large area or under a covering can increase systemic exposure.

HealthHub explains that an airtight dressing increases absorption and says not to bandage or cover treated skin unless the doctor directs it. Its examples of incorrect long use include thinning, reddish stretch marks and acne. HealthHub

The Singapore guideline warns that steroid phobia can leave eczema poorly controlled. These medicines should not be feared or abruptly abandoned. Check the specific product, body site, prescribed frequency and follow-up with the treating clinician. Annals guideline

What happens if the rash is fungal?

Redness and a defined border can fade while fungal growth continues. This altered pattern is called steroid-modified tinea, or tinea incognito. Ringworm and other superficial fungal infections need antifungal measures; suppressing inflammation alone leaves the cause untreated.

Clotrimazole is an azole antifungal. Its ingredient page lists skin, vaginal and oral formulations with different uses. It inhibits ergosterol production, disrupting fungal cell membranes. Check the route as well as the active ingredient; a tube’s colour, product name or “derm” in that name does not identify the class reliably. A combination of steroid and antifungal still needs its role, potency and duration matched to a confirmed or well-supported diagnosis. Overnight relief can reflect quietened inflammation while the infection remains.

Why are hidden ingredients a Singapore concern?

Testing found a potent steroid and mercury in a cream promoted as harmless. Q-nic’s claim was “safe, natural, non-toxic and harmless to your skin”. HSA instead found betamethasone valerate, very high mercury levels and triclosan, a preservative not allowed in cosmetic skin creams. It had been marketed for body odour, whitening and a smoother skin tone.

Carousell, Shopee, Lazada and a Lucky Plaza shop were the outlets identified in the 25 October 2024 alert. HSA had the online listings removed and seized stock at the shop. HSA alert

HSA lists numbness, dizziness and headaches among mercury’s effects after absorption through skin. Long-term exposure can damage the kidneys, digestive system and nervous system. Undisclosed steroids create a different problem: potency, interactions, pregnancy considerations and discontinuation cannot be assessed from an incomplete label. A rapid result does not establish quality when the ingredients or source cannot be traced. HSA alert

Why does a rash after stopping need assessment?

Withdrawal, a flare, contact allergy and infection can overlap. HSA’s 13 December 2022 advisory says there is no agreed diagnostic standard for topical steroid withdrawal. Even a biopsy may not distinguish it from a flare of the original condition.

That advisory recorded three local reports, all after several years of use of products tested to contain undeclared potent steroids. The observational research HSA reviewed described burning, stinging and itch, often on the face or genital area. HSA judged the evidence low quality and at risk of bias. HSA withdrawal advisory

For Q-nic users, HSA recommended prompt medical assessment. Its warning about sudden stopping without supervision listed burning, redness, itching and peeling, as well as worsening of the original condition. HSA alert

What changes the answer?

Diagnosis, potency, formulation, body site and duration must be considered together.

  • The diagnosis. Eczema, fungal infection, bacterial infection, psoriasis and contact allergy can overlap visually but need different treatment.
  • Potency and formulation. Ingredient, strength and cream/ointment/lotion form all matter.
  • Body site and area. Face, eyelids, folds, groin, broken skin and large areas require distinct caution.
  • Age and pregnancy. Children and pregnant or breastfeeding users need product-specific review.
  • Duration and occlusion. Repeated long use and covering the area can increase exposure and adverse effects.
  • Product source. HSA has repeatedly found undeclared potent steroids, mercury and other medicinal ingredients in skin products. Herbal, natural, traditional or rapid-lightening descriptions do not exclude adulteration; unknown ingredients prevent even basic risk assessment.

Seek urgent medical care for facial or throat swelling, breathing difficulty, a rapidly blistering or peeling rash, fever with a widespread rash, severe eye symptoms, or signs of a serious infection. Spreading, recurrent, painful or weeping rashes, scalp or nail involvement and failure to respond as expected also need assessment. Bring every cream used, including cosmetics and traditional products, to an appointment about a persistent or uncertain rash. Keep a suspected product’s pack and seek advice for severe irritation, widespread redness or symptoms after stopping.

The skin-care and antifungal catalogue pages can help identify medicine classes, but they cannot diagnose a rash from appearance.

Sources