noun / adjective / verb
tan
TAN/tˈæn/
A light brown coloration.
The forearm's light tan contrasts with the pale watchband mark.

Etymology
Latin tannum was crushed oak bark used to turn hides into leather. The resulting leather color supplied the comparison for skin browned by sunlight, giving tan its sun-exposure sense.
In context
Our skin has a defense system. When it's exposed to UV, our melanocytes release more melanin and we get a tan.