Hydroquinone is the most evidence-supported topical lightening agent for melasma and other forms of hyperpigmentation, and it is also the most regulated. Two facts to know up front:
- Regulatory status. The 2020 CARES Act removed hydroquinone from over-the-counter availability in the United States. Hydroquinone-containing formulations are now available only through a prescription from a licensed clinician — typically as a compounded formula from a 503A pharmacy. The DermClick Brightening Solution and Precision Dark Spot Corrector are compounded prescription formulas; they are not FDA-approved finished products.
- Duration of use. Hydroquinone is generally used in cycles, not continuously. The standard pattern in dermatology is treatment for 12 to 16 weeks, then a pause of several months on a maintenance non-hydroquinone formula, then re-evaluation. Continuous long-term use of hydroquinone (more than 6 months without a break) is associated with two specific risks: exogenous ochronosis, a paradoxical bluish-black discoloration that can be permanent and is more common in darker skin tones, and rebound hyperpigmentation when hydroquinone is stopped abruptly without a maintenance protocol.
A board-certified dermatologist team will set a duration plan with you when prescribing — typical pattern is a 12-week active phase, a re-evaluation, and a transition to a non-Hydroquinone maintenance formula. Do not source hydroquinone from international or unregulated suppliers; the strengths and adulterants in non-prescription supply are unpredictable.
Hydroquinone is contraindicated in pregnancy and is generally avoided during breastfeeding. Tell your dermatologist if either applies.