Can vitamin D deficiency causes dark lips?
Vitamin deficiency
If the body is deficient in these vitamins, the skin may change. Dark spots on the lips or an uneven skin tone can indicate a vitamin deficiency. Can vitamin deficiency affect lips? Chapped lips are a common symptom of deficiencies, especially in folate (vitamin B9), riboflavin (vitamin B2), and vitamins B6 and B12 ( 11 , 12 , 13 , 14 ). What causes lips to turn black?