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.
Copyright 1994-2018MedHelp.All rights reserved. MedHelp is a division of Vitals Consumer Services, LLC.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.