#hypopigmentation  unusual lack of skin color
  exclusion:  hyperpigmentation
  supertype:  physiological_state__physiologicalstate__physiological_condition__physiologicalcondition  the condition of the body or bodily functions
  subtype:  albinism  the congenital absence of pigmentation in the eyes and skin and hair
  part of:  leukoderma  a congenital skin condition characterized by spots or bands of unpigmented skin
  part of:  vitiligo  an acquired skin disease characterized by patches of unpigmented skin (often surrounded by a heavily pigmented border)

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