No, Phizglow cream should not be used on the lips for pigmentation, as it is meant for external use only and not for the delicate lip area. The lips have thin, sensitive skin that can easily react to strong ingredients in depigmenting creams, leading to irritation, burning, or even deeper discolouration. For lip pigmentation, use only products specifically formulated for lips, such as lip balms or serums with safe brightening ingredients like vitamin E, liquorice extract, or kojic dipalmitate, and always apply a lip balm with SPF to prevent further darkening.