A white line pathologically on the lips may be the result of a problem such as lipitis, ectopic sebaceous glands. If there is obvious discomfort, it is recommended to consult a doctor as soon as possible to identify the cause. Physiologically, lack of water may lead to dry lips with a white line. 1. Lipitis, a white line on the lips may be caused by lipitis, due to chronic inflammation of the lips, may lead to changes in the skin tissue of the lips, color changes, so there will be a white line on the lips symptoms. 2. sebaceous gland ectopic, due to the patient’s body hormone secretion abnormality or trauma, may lead to sebaceous gland ectopic, so there will be a white line on the lips symptom, and there may be a burning sensation of the skin and other reactions. If a white line on the lips is more obvious, it is best to actively seek medical examination and treatment.