#blister__bulla__bleb  (pathology) an elevation of the skin filled with serous fluid
  supertype:  #vesicle__cyst  a small anatomically normal sac or bladderlike structure (especially one containing fluid)
  subtype:  #water_blister__waterblister  blister containing a nonpurulent clear watery content
  subtype:  #blood_blister__bloodblister  blister containing blood or bloody serum usually caused by an injury

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