B17. Secondary skin lesions, basics of dermatohistopathology

From greek.doctor
  • Scales
    • Detaching fragments of a thickened stratum corneum
    • Dry and usually whitish
  • Erosion
    • Loss of epidermis
    • Heal without scarring
  • Excoriation
    • Loss of papillary dermis
    • Heals with scarring
  • Fissure
    • Painful, deep, linear opening of skin through the epidermis and into the dermis
  • Rhagades
    • Cracks or tears in the skin caused by stretching of brittle skin
  • Ulcer
    • Skin defect with loss of epidermis and upper papillary dermis
    • Usually leave scars
  • Crust
    • Dried secretion
    • Red-brown crust – blood
    • Yellow crust – serum
    • Honey-coloured crust – purulent streptococcus exudate
    • Yellow-green crust – purulent staphylococcus exudate
  • Scar
    • Permanent fibrous lesions
    • A result of the repair process
    • Hypertrophic scar = keloid scar
    • Atrophic scar
  • Atrophy
    • Thinning of epidermis and dermis
  • Lichenification
    • Increased thickness of epidermis
    • Cobblestone-like surface
    • A result of chronic rubbing or scratching