Since when have you noticed this lesion? Does it itch or is there any other lesion? Is there any history of trauma or injury to the site?
You could be having an allergic reaction to some substance to which you are either constantly exposed or to which you are being exposed again and again.
What other symptoms are you having? Let us also know if you ahve any past history of any allergic reaction or any family history of allergies, etc.
This could also be due to lip biting, lip licking, sun exposure, vitamin or mineral deficiencies, dehydration, etc.
You could apply calamine lotion at the site and see if it helps. Use a lip balm with a sunscreen - preferably a medicated one and wash your face several times a day. Apply a layer of vaseline or keep your mouth covered with a wet cloth when at work and see if it helps. Eat a healthy balanced diet and replace any deficient vitamins or minerals.
If the lesions still persist talk to your doctor about it and see what needs to be done after a proper clinical examination.
Let us know if you have any other doubts or queries.
If you are a smoker you need to stop smoking, because nicotine can cause this pigmentation.
It could also be due to an allergy or photosensitivity reaction.
Use cosmetacs that have not gone beyond the expiry date. also make sure they are reputed brands.
Use lip-sticks/lip balms which have sunscreen to prevent photo-sensitivity reactions.
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