Generally speaking, the color difference between the upper lip and the lower lip is not big, and the upper lip is darker than the lower lip, which may be caused by factors such as cold stimulation, indigestion, and applying lipstick thickness.
1. Cold stimulation: the external environment when the temperature is lowered, will lead to blood vessel contraction, will affect the oxygen-carrying capacity of hemoglobin in the lips, which will lead to the upper lip color is deeper than the lower lip color situation.
2. Indigestion: the human body to eat too much food piled up in the gastrointestinal tract, can not be digested in a timely manner, will lead to an increase in the gastrointestinal tract load and the production of toxins accumulated in the gastrointestinal tract, which in turn affects the blood circulation of the upper lip tract and the appearance of the upper lip black performance.
3. Apply lipstick thickness is not the same: lipstick may contain pigmentation elements, for the process of applying lipstick, the amount of application, thickness, etc., will lead to different degrees of pigmentation of the lips, which in turn cause the upper lip than the lower lip black performance.
As there are many reasons why the upper lip is darker than the lower lip, it is recommended to go to the regular hospital for examination, to clarify the cause of the disease, and symptomatic treatment.