The complexion turns black from the sun or cold, or wind, or dirt, or from infrequent bathing, or from eating salty things, or due to the transition of blood to a black-billed state, the complexion also turns yellow.
Such reasons are illness, worries, lack of nutrition, frequent copulation, pain, very hot air, drinking stagnant water.
Of the foods, azhgon works this way if you sniff it often and even, as they say, look at it from the vinegar, if you constantly drink it, the complexion turns yellow in the same way as from cumin, in a drink or in the form of a mud cake with vinegar, and from a long staying in a house with a lot of cumin. Excessive consumption of vinegar in food and consumption of caraway seeds have the same effect; this causes blockages in the mouths of blood vessels and it is not scarlet blood that reaches the skin, but part of the yellow bile vapor.