The natural appearance of the skin on a person’s face, especially its colour or quality. (Cambridge Dictionary)
When you refer to someone’s complexion, you are referring to the natural colour or condition of the skin on their face. (Collins Dictionary)
The complexion of something is its general nature or character. (Collins Dictionary)
The combination of the hot, cold, moist, and dry qualities held in medieval physiology to determine the quality of a body. (Merriam – Webster)
An individual complex of ways of thinking or feeling. (Merriam – Webster)
A complex of attitudes and inclinations. (Merriam – Webster)
The natural colour, texture, and appearance of a person’s skin, especially of the face. (Oxford Dictionaries)
Rosy Complexion Is Sign of Health.
Complexion? You mean, the amount of melanin in the skin?