Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern....
As per your complain blackish discolouration of the lip is due to deposition of
Melanin pigment formed by melanocytes below the skin and it can be due to a number of reasons like overuse or excessive use of lip cosmetics containing harsh chemicals, due to certain inflammatory conditions of lip, infections etc..
You should avoid using chemical containing lip and face cosmetics and any whitening ointment that contains
Steroids is also harmful..
You should apply
KOJIC ACID containing creams over the lips and face as it is safe for long term use and will help in improving the lip colour..
Do
cold compresses over the lips..
Exfoliate the lips twice a week using a gentle scrub..
While going in sun always apply a SPF 15 containing lip balm..
Hope this information helps..
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Thanks and regards..
Dr.Honey Nandwani Arora..