Tranexamic acid for dark spots: where it fits.

01 / The ingredient

What is tranexamic acid, and why is it in serums?

Tranexamic acid was not developed for skin. It is a medicine used to reduce bleeding, and dermatologists began using it off-label for melasma. DermNet notes that it is not licensed for skin conditions and that its mechanism in the skin is not fully understood; proposed effects include reducing the activity of tyrosinase, an enzyme involved in making pigment, and acting on the signals between skin cells and on small blood vessels.[3]

The American Academy of Dermatology (AAD) lists tranexamic acid among melasma treatments, noting that it may be applied to the skin or taken as a pill.[1] The serums and creams you see online and at the pharmacy are cosmetic products built on that interest. They are not the same as the treatments studied in clinics, and concentrations and formulas vary from brand to brand.

02 / Trend versus evidence

What the research actually shows.

Social media tends to present tranexamic acid as a fast fix for every mark. The published picture is more modest.

What looks promising

A 2017 meta-analysis of tranexamic acid in melasma found that it reduced severity scores, alone or added to other treatment, and judged it generally well tolerated.[4] DermNet describes a topical 5% cream as showing promising results in epidermal melasma, the more superficial type.[3]

Where it is limited

In that meta-analysis, the effect of topical tranexamic acid on its own did not reach statistical significance. The authors pointed to few randomised trials, generally low study quality and different doses and schedules, and called for larger trials.[4]

What it is not

Not a permanent result. The same authors note that treatment needs to be maintained over time, and that melasma often returns after treatment stops.[4]

None of this makes a serum useless. It means a good result usually comes from a whole plan, with sun protection at its centre, rather than from one bottle.

03 / Who it may suit

Which dark spots it suits, and which it may not.

“Dark spots” covers several different things, and they do not all respond the same way. That is why it helps to know what you are looking at before you choose a product; melasma or dark spots? explains the difference.

• Melasma, the brown or grey-brown patches that often appear on the cheeks, forehead or upper lip. This is where most tranexamic acid research has been done. The AAD lists sunlight, birth control pills and even stress among its triggers, and notes it can last for years.[1]
• Marks left after breakouts, which may be brown or red. Brown marks and red marks are not the same problem, as red or brown post-breakout marks explains, and evidence for tranexamic acid here is less established.
• Sun spots and general unevenness, where sun protection and gentle consistency usually matter most. Caring for uneven skin tone covers the wider routine.

A topical product may suit you if your discolouration is mild, you already wear sunscreen every day and your skin tolerates actives. It may not be the right next step if your skin is irritated or reactive, if you are already layering several brightening products, or if the patch has not been looked at by anyone.

04 / Trying it sensibly

How to add tranexamic acid to your routine.

1. Put sunscreen first.

   The AAD says sunlight makes the skin produce more pigment, which can darken melasma and cause new patches, and that effective treatment of dark spots begins with sunscreen.[1][2] For melasma, dermatologists often suggest a tinted sunscreen containing iron oxide.[1] See choosing a sunscreen you will actually use and tinted sunscreen and visible light.

2. Introduce one new product at a time.

   Many tranexamic acid serums also contain niacinamide, vitamin C or acids. Starting one product on its own lets you see how your skin responds; how to introduce a new skincare product walks through the process.

3. Watch for irritation.

   Redness, irritation, dryness and scaling have been reported with topical use.[4] The AAD advises stopping a product that burns or stings, and notes that irritation from skin or hair products can itself cause dark spots.[2]

4. Keep the rest of the routine calm.

   Stacking several brightening actives rarely speeds things up and can make skin uncomfortable. Active ingredients: when more is not better explains why.

5. Judge it over months, not days.

   The AAD says that even with a treatment plan, melasma usually takes between 3 and 12 months to show results, and that a spot a few shades darker than your skin usually fades within 6 to 12 months.[1][2] Photos taken in the same light are a fairer guide than the mirror.

If you are pregnant or breastfeeding, ask your doctor before starting any new active. Pregnancy can also trigger melasma in the first place.[1]

05 / The doctor’s domain

Tablets, injections and patches that need a dermatologist.

Tranexamic acid tablets are a prescription medicine. DermNet notes that people with a history of blood clots, heart disease or stroke should not take it, that a risk of clotting complications cannot be entirely excluded, and that long-term safety for melasma is largely unknown.[3] Injections into the skin have also been studied. Whether either is appropriate, and in what form, is a medical decision. Please do not buy tablets online for your skin.

If you have also seen glutathione promoted for a brighter tone, glutathione and skin tone looks at that trend with the same questions.

A few common questions

Frequently asked questions.