Dermatologic nomenclature

Primary lesions

Dermatology Nomenclature

Small lesions (<0.5cm)

  • Macule – flat, cirumscribed, colored, non palpable
  • Papule – raised, solid and palpable
  • Vesicle – raised, palpable, clear fluid-filled
  • Pustule – raised, palpable, pus filled (leukocytes or keratin)

Large lesions (>0.5cm)

  • Patch – large macule (flat non-palpable colored area)
  • Plaque – superficially raised, circumscribed solid area
  • Nodule – distinct large papule
  • Bulla - large vesicle (blisters if epidermal layer completely sloughed off)
  • Wheal – firm and edematous plaque (edema of the dermis)

Other

  • Plaque/scaley papule
  • Eschar
  • Erosion/ulcer
  • Purpura/petechia
  • Plaque/smooth papule

Secondary lesions

Section One

  • Scales – dead epidermal cells (dry white dandruff)
  • Cursts – dead epidermal cells + serum (oily secretions)/pus
  • Erosion –focal effacement of epidermis
  • Ulcer – focal effacement of epidermis +dermis
  • Fissure – linear crack into epidermis +dermis
  • Atrophy – thinning of epidermis +dermis
  • Scar – healed skin with connective and epithelialized granulation tissue
  • Lichenification – thickened epidermis
  • Petechia – non-blanching, micro- hemorrhages (3mm) into the dermis
  • Purpura - non-blanching, small hemorrhage (0.5-1cm) into dermis
  • Ecchymoses – large area of hemorrhage into dermis (a.k.a bruising)

See Also