Hydroquinone for skin: melasma, ochronosis and the EU ban

What hydroquinone does, and how the trials use it

Hydroquinone is used to lighten dark patches. The authors of a 2024 trial call topical hydroquinone the gold standard for melasma, and note it has numerous side effects.¹ Its role in the evidence is mostly as the comparison: in a 20-person split-face trial, a 3% tranexamic acid cream lowered melasma scores as well as 4% hydroquinone over eight weeks.¹

A 2025 trial of 99 patients compared tranexamic acid and niacinamide creams with 4% hydroquinone for three months. All improved, and the authors report adverse reactions and relapse in the hydroquinone group.² A 2024 trial of a cream with 10% nicotinamide, 5% magnesium ascorbyl phosphate and 5% hyaluronic acid against 4% hydroquinone found both improved with no significant difference in melasma scores, though the fall was numerically larger with hydroquinone; only a skin colour measurement favoured hydroquinone significantly.³

So hydroquinone works, and the newer options are close in small trials. None of this tells you which to use; that is a question for a dermatologist.

The risk with long, strong use: ochronosis

Exogenous ochronosis is a blue-black or grey-blue discolouration of the skin, reported with hydroquinone use. A 2022 systematic review of 56 articles and 126 patients found it most often in middle-aged women, in Black people, and in Fitzpatrick skin types V and VI. Median use before it appeared was five years, and it was most often reported at concentrations above 4% or at unknown concentrations. The authors conclude that hydroquinone above 4% and courses longer than 3 months may be associated with new-onset ochronosis.⁴

The review is of case reports, so it cannot tell you how common ochronosis is, only who gets it.

What the rules say

Snifff's summary above gives the position in the EU and India. If you buy a pigment product that does not name hydroquinone, check the label for other lightening ingredients, such as those on our kojic acid and alpha arbutin pages. In the EU, hydroquinone is listed in Annex II as a prohibited substance, with an exception for professional artificial-nail products at up to 0.02% (Annex III, entry 14).⁵ The India half is Snifff's.

Using hydroquinone with other products

The 2024 trial above used a combination cream against hydroquinone, not hydroquinone layered with other products.³ We did not find a study of layering hydroquinone with other actives as separate products.

Hydroquinone in pregnancy and breastfeeding

Snifff's note above gives a reason, a high absorption figure, and we did not independently verify that number. We found no trial of hydroquinone creams in pregnancy to put beside it. The sensible step, if you are pregnant or trying, is to ask before using it.

Evidence on cosmetic products in pregnancy is limited overall, so ask your doctor or midwife about the specific product you use.⁶

What you will see on the label

On a label, look for Hydroquinone. Snifff shows it as High risk. For the rest of the formula, see what the score means and how to read the list.

As Snifff shows it

Hydroquinone

High risk

Pregnancy and nursing

Avoid during pregnancy and lactation: topical hydroquinone has high systemic absorption, about 35% to 45%.

Regulatory gap

The EU prohibits hydroquinone in cosmetics. India regulates it as a prescription drug, but its cosmetic rules do not state the same explicit ban.

Wording as it appears in the extension, which can change between releases.