Melasma is the hardest pigment problem to treat, and these are the two ingredients that come up most.
Hydroquinone is the long-standing prescription standard. Tranexamic acid is the newer option that has gained ground fast, partly because it is gentler and partly because it works on a different step of the process.
The useful comparison is not just which fades faster. It is which one you can safely keep using, because melasma comes back.
Both live almost entirely on the pigment row, but they intervene at different points in the same chain. Hydroquinone blocks tyrosinase, the enzyme that manufactures pigment. Tranexamic acid interrupts the signal that tells pigment cells to start manufacturing in the first place. Tranexamic acid also picks up a small inflammation credit for the vessel-driven redness in melasma, which hydroquinone has no effect on.
Fading existing melasma | Hydroquinone, narrowly | Moderate
It remains the benchmark. But the gap is smaller than its reputation suggests. In a randomized study of 50 people, 4% hydroquinone reduced melasma scores by about 55% over 8 weeks, while microneedling with topical tranexamic acid reduced them by about 57% — a difference that was not meaningful (J Cosmet Dermatol, 2021).
Long-term maintenance | Tranexamic acid | Moderate
This is the real separation. Hydroquinone is intended for courses of a few months with breaks in between. Tranexamic acid has no such ceiling.
Safety over time | Tranexamic acid | Consensus
Long, uninterrupted hydroquinone use carries a small risk of ochronosis — a blue-gray discoloration that is very difficult to reverse and is more often reported in deeper skin tones.
Melasma with visible redness | Tranexamic acid | Moderate
Melasma often has a blood-vessel component. Tranexamic acid addresses that pathway; hydroquinone does not.
Marks left after breakouts | Hydroquinone | Moderate
For discrete dark spots rather than diffuse patches, the stronger pigment blocker generally works faster.
Gentleness | Tranexamic acid | Moderate
Hydroquinone can irritate, and irritation on pigment-prone skin can make the problem worse rather than better.
Access | Tranexamic acid | —
Available over the counter in serums. Hydroquinone requires a prescription in the US, where the 2% over-the-counter version was removed from the market.
Skin of color | Tranexamic acid, for ongoing use | Moderate
Both work. But melasma is most common and most persistent in deeper skin tones, which means long-term use is the norm — and that is exactly the scenario hydroquinone is least suited to.
A very common approach uses both, in sequence rather than forever.
A typical pattern:
- Clearing phase: hydroquinone for 8–12 weeks under supervision.
- Maintenance phase: switch to tranexamic acid, azelaic acid, or niacinamide to hold the result.
- Repeat the clearing phase only if needed, with a break in between.
They can also be layered during the clearing phase, since they block different steps.
The part nobody wants to hear: neither works without daily sunscreen. Melasma is driven by light — including visible light from the sun and, to a lesser degree, from screens. A tinted mineral sunscreen with iron oxides blocks visible light in a way that clear chemical sunscreens do not, and for melasma that difference matters more than which fading cream you chose.
Also worth knowing: melasma is a chronic condition that relapses. Treatment is management, not cure, and anyone promising permanent clearance is overselling.