coffee is commonly associated with lip discoloration, and discontinuing this
may help. Sun damage is also very common, and it might be
important to avoid sunlight and also to use a good sunscreen lip
protectant when you go outside. You should see your primary care
doctor about this issue because there is one potentially serious
cause of dark spots on the lips which needs to be ruled out. A new
dark spot could indicate a melanoma, which is a very serious form of
skin cancer. Your doctor can rule this out with a quick exam in most
cases, although a suspicious mole might require a biopsy just to be
on the safe side. See your doctor at your earliest convenience!
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