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Unfortunately, you could no longer buy hydroquinone over-the-counter, so you’d need a prescription.
However, you might still make do with niacinamide.

Niacinamide lightens dark spots after four weeks but stops lightening after two months (viaHealthline).
It also has vitamin C, which can assist in skin brightness.
It currently retails for $21.99 atUlta.
Differin’s hydroquinone serum was a favorite of many dermatologists and won many beauty awards.
People might still be mourning its loss too much to be open to a replacement this soon.