What should you not mix with hydroquinone?
Hydroquinone works best alone, on a schedule, with sunscreen. Most problems come from helping it too much.
How hydroquinone works, briefly
Hydroquinone slows the enzyme that makes pigment. It is prescription strength in most places, it is typically used in cycles rather than indefinitely, and it is unforgiving of two things: sun exposure, which undoes the progress, and irritation, which can itself trigger more pigment in deeper skin tones.
What to keep in a separate routine
- Benzoyl peroxide. An oxidizer. It can react with hydroquinone and cause a temporary brownish discoloration on the skin. Use them at opposite ends of the day, and follow your dermatologist's schedule for the hydroquinone.
- Exfoliating acids. Hydroquinone and acids can each irritate, and together more so. If your dermatologist paired them, follow that plan; otherwise avoid layering them while you are starting treatment.
- Physical scrubs. Same reason. Irritation is the enemy of a pigment plan.
Do not stack the brighteners
Arbutin, kojic acid, tranexamic acid, and azelaic acid all target pigment too. On top of prescription hydroquinone they mostly add irritation risk without being necessary. Dermatologists do sometimes combine them, deliberately and at chosen strengths. Doing it yourself is where the trouble starts. Ask before adding any of them.
The combination that is supposed to exist
Hydroquinone plus a prescription retinoid (often with a mild steroid) is a well-established melasma treatment. If that is what you were prescribed, follow the schedule exactly. If you were prescribed hydroquinone alone, do not add a retinoid on your own; ask.
Two hydroquinone products is one too many
If a dark-spot serum and a prescription cream both contain hydroquinone, you are doubling a prescription-strength dose. Use only what your dermatologist prescribed.
Common questions
Can I use vitamin C with hydroquinone?
Generally yes, and many dermatologists like the pairing (vitamin C in the morning under sunscreen, hydroquinone at night). If your skin is sensitive, introduce one at a time.
Why did my skin turn brownish where I applied hydroquinone?
If you also use benzoyl peroxide, the two can react and cause a temporary discoloration. Separate them and mention it to your dermatologist. Any persistent darkening is a reason to stop and call.
How long can I use hydroquinone?
That is a prescriber decision. It is usually used in cycles with breaks, partly to reduce the risk of a rare paradoxical darkening with very long continuous use.
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