It's been around 1 month I am using an ointment called eumosone at night. I have dark area near my mouth which intensifies when I go out in sun. This makes my skin uneven a lot. After using this ointment the dark patches have reduced but not gone fully. Again few days back I was just out in sun for few hours my skin has come to its initial stage. Please suggest me what do I do to reduce the unevenness on my face permanently.