Hydroquinone: a skin-lightening medicine, what the sources say

Reviewed October 17, 2026

The short answer

Hydroquinone is a topical skin-lightening agent used for hyperpigmentation. DermNet says New Zealand and numerous other countries sell it only on prescription, and Cleveland Clinic's drug sheet speaks of the prescription label. This page reports what those sources say. It gives no strengths, schedules or dosing: those are for your prescriber.

What is it used for?

DermNet lists melasma, dark marks left after acne or other skin inflammation, freckles and similar spots, among other pigment problems. Cleveland Clinic describes the medicine as one that lessens the look of dark spots.

How does it work?

DermNet says hydroquinone lightens pigment in the skin's outer layer by reducing the making of new melanin. It does not treat pigment that sits deeper, in the dermis, and DermNet adds that melasma can resist treatment and often needs several approaches.

Irritation, allergy and other risks

• Cleveland Clinic: slight irritation, redness or dryness usually needs no medical attention, but report it if it lasts or bothers you. Treated skin that burns, itches, scabs or flakes should be reported promptly, and so should signs of an allergic reaction.
• DermNet: stop treatment if redness, scaling, itching or weeping becomes more than slight.
• DermNet: the usual preservative in commercial products, metabisulphite, can trigger an allergic reaction, and people allergic to hydroquinone or to such ingredients should not use it.
• DermNet: a darkening condition called exogenous ochronosis has followed high concentrations used many times a day for years.
• DermNet separates hydroquinone from a different chemical, monobenzyl ether of hydroquinone, capable of causing permanent pigment loss.
• DermNet reports that high-dose oral hydroquinone caused cancer in rats, and that no human cancer cases from topical use have been reported after about 50 years of use.

Sun protection

Cleveland Clinic says the medicine works best if you limit time in strong sun and wear sunscreen and protective clothing, and to avoid sun lamps and tanning beds.

Pregnancy and breastfeeding

DermNet says safe use of the topical form during pregnancy and lactation has not been established. Cleveland Clinic lists pregnancy, plans for pregnancy and breast-feeding among the things to tell your care team first. If you are pregnant, planning a pregnancy or breastfeeding, ask your prescriber before using it.

Other products

Both sources single out benzoyl peroxide: Cleveland Clinic lists it as a possible interaction, and DermNet advises against other topical medicines alongside hydroquinone, benzoyl peroxide in particular. Ask your prescriber what else to use with it.

What not to conclude

This page cannot say whether hydroquinone suits you or how to use it. Nitavera is an ingredient-name checker: it cannot see a prescription, a strength or your medical history. Questions about starting, stopping or combining it go to your prescriber or pharmacist.