Hi Doctor, Skin Around My Mouth Is Completely Dark Compared

Hi Doctor,

Skin around my mouth is completely dark compared to my skin on chin , nose and forehead...I have this issue from 10 years and im 25 years old now....I tried every possible home remedies but it doesn't fix the color of my skin...I tried corticosteroid for sometime it gave me amazing result but since it has lots of side effects I stopped it....I tried kojivit plus but no use.....tried salicylic acid peeling and no use....im very frustrated with this condition ....don't know what to do....I want a permanent solution to this.... I cant upload my photo but you can imagine a fair girl with extremely dark skin around my mouth like a mustache....please please help me ....