What Is The Treatment For Dark Skin Between Upper Lip And Nose Even After Quitting Smoking?

hello, doc! I have a problem. i used to smoke sometime back and after smoking, to hide the smell, used to apply my perfume around the mouth, so that it will smell perfume, not cigarettes. it was intention to hide from my family. it wasn t every time, but seems like i ve done it time to time for past 1.5-2 years. Now my skin between my nose and upper lip little bit darkish. i am assuming, it s because of applying perfume. happily, now i stopped smoking, and obviously not doing that foolish thing again, but skin is remaining darker than other skin parts of my face. could you help me with treatment? thank you!