Multiple: Wa-alaikum-salaam it can be due to lip licking, B12 deficiency, smoking, overexposure to sun or post inflammatory hyperpigmentation. Take some B12 supplements and avoid lip licking.Apply a good lip balm and sunscreens with spf 30 1/2 half an hour before going out in sun. If still the symptoms do not improve then pls get a clinical examination done by a dermatologist.Bacterial and fungal infect.
Answered 2/15/2015
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