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Hydroquinone

Hydroquinone in skincare: Skin-lightening agent (not a permitted EU cosmetic). What it does on skin, how strong the evidence behind the claim actually is, the concentrations in normal use, who reacts to it, and where it stands in pregnancy and sunlight. On a label it appears as Hydroquinone.

Pigment and brighteningSkin-lightening agent (not a permitted EU cosmetic)Evidence: Strong

On the label: Hydroquinone. Also called: Found in illegally imported "whitening" creams.

This is an ingredient reference, not a diagnosis and not a treatment plan. It describes what substances are and what the published evidence supports; it does not tell you what your skin has or what to put on it. A rash that spreads, hurts, weeps, does not settle, or comes with feeling unwell is a reason to see a doctor or pharmacist, not to change serum.

What it is

A phenol that blocks tyrosinase, the enzyme that starts melanin production, and reduces the pigment cells' output while it is used. It was for decades the reference treatment for melasma and stubborn pigmentation, and it works. It is on this list not as a recommendation but because people meet it: it is one of the substances most often found in skin-lightening creams bought online or brought back from abroad.

What it does on skin

It suppresses pigment production wherever it is applied, including on skin you did not intend to lighten, which is why patchy pale areas around a treated spot are a recognised outcome of careless use. The effect reverses when you stop, so the treatment is a course with an end, supervised, not a product you use indefinitely.

What the evidence is worth

Evidence: Strong

The efficacy evidence is strong and old. The safety questions are what changed the rules: prolonged, unsupervised, high-strength use — particularly on darker skin — can cause exogenous ochronosis, a blue-black discolouration that is difficult to treat and can be permanent. That is the outcome that supervision is meant to prevent.

How it is used

In countries where it is available it is a prescribed course of treatment with a defined duration and follow-up, not an over-the-counter cosmetic. If pigmentation is the problem, the cosmetic and prescription alternatives — azelaic acid, retinoids, vitamin C, tranexamic acid, and above all daily sun protection — are the route your clinician will take first.

Typical concentration in normal use: Not permitted in EU skin cosmetics. That is a description of the market, not a recommendation, and it is not a dose.

Who reacts to it

Irritation, contact dermatitis, a temporary halo of lighter skin around the treated area, and with long unsupervised use the ochronosis described above. Every one of those risks rises when the product is unlabelled and the concentration is unknown.

Pregnancy and breastfeeding

Stopped in pregnancy

Not used in pregnancy. Pregnancy-related melasma is common and frustrating, and the safe approach is rigorous sun protection plus treatments your clinician approves — not an unlabelled cream from an online marketplace.

Sunlight

More sun-sensitive

Skin with suppressed pigment production burns more easily, and any pigmentation treatment fails without sun protection because ultraviolet exposure is what drives the pigment in the first place.

Rules and labelling

Hydroquinone is prohibited in cosmetic products in the EU except in professional artificial nail systems; it may not lawfully be sold here in a face cream. In the United States it is regulated as a medicine rather than a cosmetic. Imported skin-lightening creams are a recurring subject of national safety recalls, and the same products have repeatedly been found to contain potent steroids or mercury as well. The World Health Organization publishes an information sheet on mercury in skin-lightening products.

What it goes with, and what it does not

Not applicable in the EU. If you have brought a product home from abroad and it has lightened your skin quickly, that speed is a reason to have it checked rather than a reason to continue.

One thing people get wrong

The myth is that a cream sold openly on a large marketplace must be legal and tested. Skin-lightening creams are among the most frequently flagged product categories in European safety alerts, precisely because unlabelled hydroquinone, potent corticosteroids and mercury keep turning up in them. If a cream lightens skin within days, something in it is not a cosmetic.

Sources: EU Cosmetics Regulation (EC) No 1223/2009 and its annexes, as published in the European Commission's CosIng database, for every statement about what is permitted, restricted or banned · opinions of the Scientific Committee on Consumer Safety (SCCS) and safety assessments of the Cosmetic Ingredient Review (CIR) for the concentration positions · standard dermatology reference material for mechanism, tolerability and contact-allergy patterns · checked 2026-09-06. Deep links are deliberately omitted where a stable public URL could not be confirmed.

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