Kemungkinan tu ada..tapi tak banyak research yang confirmkan pasal ni. Ada satu yang menyatakan, vaseline ni dia lebih kurang mineral oil. Bila terdedah kepada matahari, dia akan menyebabkan proses "tanning" tu berlaku dengan cepat. Tapi biasanya melibatkan bibir bahagian atas la..
Tapi banyak faktor yang menyebabkan bibir hitam:
1. smoking , 2. consuming too much hot caffeinated foods such as coffee and tea, 3. too much exposure to the sunlight , 4. chemical reaction from an applied product , 5. unreliable cosmetics ,
some medical results of darken lips include: 1 . iron deficiency , 2 . lack of vitamin-B complex , 3 . too much iron , 4 . allergies , 5 . lack of magnesium and calcium ,
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