Suggest Treatment For Black Pigmentation On Lips

How many days do I need to apply flucort h to disappear black color in my lips? I applied it for 30 days. 1 or 2 days missed. But if I stop it, I feel the hardness in lips comes again and so the black pigment. I stopped it because I got some phlegm kind of substance on the surface of the lips, which we generally get due to inflammation