LECTURE 18 SKIN

• What is skin ?

  • It is the largest part
  • It has 3 layers which is dermis, epidermis and subcutaneous layers
  • EPIDERMIS
  • *OUTER EPIDERMIS - act as a barrier and our first line of defense
  • *INNER EPIDERMIS - holder of important glands like sweat and oil glands
  • Also, skin secretes antimicrobial chemicals like acidic and salty secretion, waterproofing keratin and sebum

  DERMIS - THICKEST

  SUBCUTANEOUS LAYERS-

  composed of fats
• What are the normal flora of the skin

  1. Propionibacterium acne
  2. Corynebacterium spp.
  3. Staphylococci

  Staphylococci epidermidis Staphylococci aureus  

  4. Strepotococci sp

  5. Candida albicans ( yeast )
• What are the bacterial skin diseases?

  1. Folliculitis
  2. Scalded skin
  3. Scarlet fever
  4. Erysipelas
  5. Pyoderma and impetigo
  6. Acne
  7. Burn infection
• What is Faculititis ?

  • It is caused by staphylococcus aureus
  • And it is a skin abcess ; encapsulated that's why it can't be reach by antibiotics
• What is Scarlet fever

  • Caused by streptococcus pyogenes
  • Soar throat, fever and rash that is caused by toxins
  • Can lead to rheumatic fever and other complications
• What is scalded skin

  • Caused by S. aureus
  • Vesicular lesion on the whole surface of the skin
  • Common in infants
• What is Erysipelas 


  • Caused by S. Pyogenes
  • Skin lesion that spread through systematic infection
  • Rare today but but common and fatal before antibiotic
• pyderma and impetigo

  • caused by Staphylococci and streptococci
• pyoderma and impetigo

  • caused by Staphylococci and streptococci
  • common to infants due to hand and fomite transmission
• what is acne 


  • it is caused by pripionibacterium acne
  • skin lesion due to excessive male hormones and common to teenagers
• what is burn infection 


  • caused by pseudomonas auruginosa
  • growth of the bacteria is under the eschar and often causeb by nasocomial infections or hospital acuired infections
  • difficult to diagnose and treat
  • causative agent may be also antibiotic resistance