unpigmented
adjective
un·pig·ment·ed ˌən-ˈpig-mən-təd 
: having no pigment : nonpigmented
unpigmented cells
unpigmented skin
Example Sentences
Recent Examples on the Web Many birds lay white, unpigmented eggs—as do all lizards, turtles, crocodiles, and the only known egg-laying mammals, the platypus and the echidna. 
National Geographic, 18 Sep. 2017 The first layer of skin eventually peels off, leaving a pale or pink area of unpigmented skin. Dr. Manny Alvarez, Fox News, 12 July 2017
National Geographic, 18 Sep. 2017 The first layer of skin eventually peels off, leaving a pale or pink area of unpigmented skin. Dr. Manny Alvarez, Fox News, 12 July 2017 Word History
First Known Use
1853, in the meaning defined above
Medical Definition
unpigmented
adjective
un·pig·ment·ed -ˈpig-mənt-əd
: not pigmented : having no pigment