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Figure 4. Phototherapy-induced inflammatory hyperpigmentation (PIH). 46-year-old Fitzpatrick II Female pre-treated with our skincare regimen (Tretinoin, Vitamin C, and Hydroquinone 4%) 1 month prior to intense pulsed light (IPL) phototherapy (left) with a normal physiological hyperpigmentation response to phototherapy (right). PIH normally occurs within 6 h of IPL treatment and typically resolves at 5-7 days