 An acquired absence of pigment found in spots or patches, although the margin of these spots shows an increased amount of pigment matter. (J Henery Allen)

 Loss of pigmentation characterized by various shaped and sized, smooth, non elevated, non infiltrated usually sharply demarcated patches at times with slightly hyperpigmented borders. (Sulzberger woy Witten).

 An acquired disease characterized by the progressive disappearance of normal pigmentation in variously shaped and sized white, smooth sharply defined patches with hyperpigmented borders. (F.M.Dearborn)

 Vitiligo or leucoderma is an affection characterized by circumscribed patches of skin, from which the pigment has disappeared to a lesser or greater extent. (Douglass)


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