i experienced the same thing! i have an olive skin tone and i noticed around my mouth and chin area that my skin colour had darkened! i lowered my BP dosage and moisturized the area regularly with the moisturizer that it comes with and after 2 days i noticed that it gradually started to go back to its normal colour again. i've been using it for a week. i guess it because our faces don't go red/pink so when our skin is irritated and trying to adjust it just appears darker, but as your skin adjusts the colour should go back to normal
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