Use a broad-spectrum sunscreen with SPF 30 or higher every day
Apply a topical retinoid at night
Use vitamin C serum in the morning
Try niacinamide to help fade dark marks
Use azelaic acid for post-acne dark spots
Consider alpha hydroxy acids like glycolic acid or lactic acid
Use salicylic acid if you still get acne
Keep skin moisturized with a non-comedogenic moisturizer
Avoid picking, squeezing, or scrubbing pimples
Use hydroquinone only under medical guidance
Consider chemical peels from a dermatologist
Consider laser or light treatments from a dermatologist
Be consistent for several weeks to months
See a dermatologist if spots are severe, persistent, or worsening