hi..thanks for your query..
You need to know about the causes of dark lips to be taking precautions better.A lot of people have it genetically predetermined,although parents may/may not have it. A frequent cause of non genetic lip darkening is the use of lipsticks /coloured balms/gloss , as these tend to darken the lips over a period of time.So try and not use it too often..If you have to use it,then let it be allegen free and replace them every 2 months.I would advise you to start using medicated lip balms with SPF and to reapply it several times in a day..that helps in reducing further darkening. Depiwhite cream or any others having Kojic acid
can be used twice a day for lightening of lip color. It usually does not have side effects. however u can check for tolerance of the product by applying it for a short time on the first application.If you have a genetic tendency to dark lips, the pigmentation has chances of coming bak after the cream is stopped.
U can also opt for mild chemical peels
once in 15-30 days to exfoliate better and lighten faster.