Melasma and age spots: oral and topical medications—what changes? Precautions with tranexamic acid and hydroquinone

For melasma and age-spot treatment, oral tranexamic acid and topical hydroquinone or tretinoin are commonly used, and both are reported to improve skin tone[1][2][3]. However, oral medications carry a rare risk of thrombosis (blood clots), and topical medications tend to cause irritation and redness, so selection must be tailored to individual constitution and skin condition[4][5]. Whether medication alone is sufficient or combination with laser treatment is needed also depends on the type of spot.

How does oral tranexamic acid change melasma?

Tranexamic acid is an oral medication reported to lighten melasma tone. A study synthesizing 28 randomized controlled trials showed promising results for melasma with oral medications, topical treatments, and injections alike[1].

Originally a hemostatic agent, it is thought to work by suppressing melanin production pathways and inflammation[6]. A 24-week comparative trial suggested the possibility of improving melasma redness[7].

What risks should you watch for with oral medication?

The primary concern is thrombosis. Although rare, serious complications have been reported, including deep-vein thrombosis in the legs, pulmonary embolism, and cerebral thrombosis[4].

For this reason, use with caution is recommended, noting the tendency toward blood clotting[6]. Some practitioners prefer topical medications to avoid the thrombosis risk[2]. If you have a history of blood clots, existing medical conditions, or are taking other medications, be sure to inform your doctor beforehand.

Topical hydroquinone and tretinoin—what is the difference?

Hydroquinone prevents melanin production, while tretinoin accelerates skin renewal to expel melanin outward[3][5]. Because they work differently, they are sometimes used together.

Hydroquinone at 2–5% is typically applied once daily before bed for at least 3 months[2]. Skin irritation, redness, and contact dermatitis may occur, and long-term color changes are also a concern[2].

Tretinoin alone can take 20–40 weeks to show results[5]. Contact dermatitis, redness, and peeling are common side effects[5].

Medication alone or in combination—which to choose?

In actual melasma treatment, combining several medications is more frequently reported than using a single agent[3]. A review of six comparative trials found that combining oral tranexamic acid with 1064 nm laser was the most commonly used method[8].

On the other hand, one trial showed that topical medication alone reduced the tone index by 3 months[2]. Which is better depends on the type of spot, intensity, and how much downtime you can accommodate.

What are the limitations even with medication?

Melasma is a resistant spot that worsens with sun exposure and female hormones[9]. Even if medication lightens it, sun exposure can darken it again, so continued use alongside sun protection is important.

Hydroquinone's effects may reverse after discontinuation[2]. Deciding from the start how long to use it and how to taper off will make the process easier.

What should a consultation confirm to find the right medication for you?

Key points to confirm are whether the spot is melasma or another type of spot, and whether you have a history of thrombosis or are taking other medications. The type of spot determines whether the medication is suitable or whether combination with laser treatment is preferable.

Also discuss the duration of use, how to discontinue if side effects occur, and any pregnancy plans. Since skin and body condition differ for each person, it is most reliable to have a diagnosis and decide with your doctor.