Choosing between azelaic acid and arbutin can be tricky, but understanding how each works helps tailor your skincare routine more effectively. From my experience, azelaic acid is a great multi-tasker, especially for those struggling with acne and the stubborn dark spots left behind. Its anti-inflammatory properties reduce redness and calm breakouts, while its ability to regulate keratinization and inhibit melanin production makes it effective for fading hyperpigmentation. On the other hand, arbutin shines when used as part of a combination treatment. It’s a gentler alternative that primarily targets pigmentation by inhibiting tyrosinase, an enzyme involved in melanin synthesis. I often recommend pairing arbutin with other complementary actives like tranexamic acid or kojic acid for enhanced brightening results. This synergy amplifies the overall effect on uneven skin tone. Based on what I’ve tried, incorporating 10% azelaic acid into your routine alongside other acne treatments can significantly improve both acne and dark spots. Consistency is key, as visible improvements typically appear after several weeks of regular use. For those with more sensitive skin or looking to brighten without irritation, arbutin-based products combined with proven complementary ingredients offer a balanced approach. Ultimately, picking the right ingredient depends on your main concern—acne reduction or pigmentation—and your skin’s tolerance. Experiment cautiously and consider patch testing new products. And remember, layering skincare with proven actives that complement each other often yields the best results. What has worked for you in managing acne or hyperpigmentation?