Tranexamic Acid.

What it does

Applied topically it helps interrupt the signaling between pigment-making cells and the skin, which makes it especially studied for melasma and stubborn, hormone-driven dark patches that resist other treatments.

Benefits

• Targets melasma and stubborn, recurring dark patches
• Helps fade post-inflammatory marks and even out skin tone
• Performs comparably to hydroquinone for pigmentation in some studies
• Pairs well with other brighteners and gentle enough for ongoing use

Side effects

• Topical use is usually well tolerated, with occasional mild irritation
• Results on pigmentation are gradual and build over weeks of consistent use

Who it's for

Melasma, sun- or hormone-driven dark spots, and uneven tone

Who should be careful

Oral tranexamic acid carries blood-clot risks and is not for people with a history of clots, stroke, or seizures; the topical skincare form does not carry the same risk but such individuals should clear oral use with a doctor