By birth lips were normal though they became slightly dark over a period of time may be due to eating habits, sun exposure etc, but for the last 13 years I was smoking 2-3 cigarettes a day and I have noticed that it have become worse and lips have turned into black / very dark over a period of time. upper lip is dark with no redness whereas lower lip is better of with darkness only at lower portion of lower lip and upper portion is still red. Best Line f treatment to reduce darkness by min 50%.