#hyperpigmentation  unusual darkening of the skin
  exclusion:  hypopigmentation
  supertype:  physiological_state__physiologicalstate__physiological_condition__physiologicalcondition  the condition of the body or bodily functions
  subtype:  suntan__tan__sunburn__burn  a browning of the skin resulting from exposure to the rays of the sun

No statement uses or specializes hyperpigmentation; click here to add one.