Evidence-based guidance on retinol / retinoids and its risk of triggering or worsening dark spots, melasma, and post-inflammatory hyperpigmentation.
Retinoids are valued for cell turnover and pigment correction, but they commonly cause irritation, dryness, and photosensitization — all of which can trigger post-inflammatory hyperpigmentation if introduced too quickly.
Retinoids are best introduced slowly, at night, with moisturizer and daily SPF. Wash-off retinol masks are lower risk than leave-on serums.
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