Primary Lesions
      -macule
      -patch
      -papule
      -plaque
      -nodule
      -tumor
      -vesicle
      -bulla
      -pustule
      -cyst
 Secondary Lesions
      -scale       
      -crust
      -excoriation
      -lichenification
      -maceration
      -fissure
      -erosion
      -ulcer
 Distinct Lesions
      -wheal/hive
      -burrow
      -comedone
      -atrophy
      -keloid
      -fibrosis
      -petechiae
      -telangiectasis
      -milium

An ulcer is a deep open wound with partial or complete loss of the dermis or submucosa