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Prescription topical. Hydroquinone is used at 2-4% (often as the triple-combination with a retinoid and a mild corticosteroid), applied to pigmented areas usually at night, in time-limited courses (commonly with treatment breaks) under clinician supervision, always with daily sunscreen. There is no oral or systemic use. Avoid indefinite continuous use because of ochronosis risk. This library does not provide an ingestion protocol.

Evening

Hydroquinone 2-4% cream or the triple-combination (with retinoid + mild steroid), under a clinician

Topical use, typically ~2-5% tranexamic acid in a serum applied to areas of melasma once or twice daily, alongside daily sunscreen. There is no oral or systemic dose in this cosmetic context — the ingested medication is a separate prescription use with clotting-risk considerations. This library does not provide an ingestion protocol.

Any time

Leave-on topical serum (≈2-5% tranexamic acid)

• For topical (skin) use only — not for ingestion, not for injection
• Prolonged continuous or high-strength use (ochronosis risk) — use time-limited courses
• Known allergy/sensitivity to hydroquinone

• Peroxides (benzoyl peroxide, hydrogen peroxide)
• Other irritating actives (retinoids, acids)

• Topical use here is for skin only — do not self-medicate with oral tranexamic acid for melasma without a clinician (clotting-risk considerations)
• Known allergy or sensitivity to tranexamic acid or formulation excipients
• Application to broken, irritated, or compromised skin until healed

• Other leave-on brighteners/actives