Alopecia

• Phases of hair growth
  • Anagen phase – hair growth
  • Catagen phase – transition phase
  • Telogen phase – resting phase
  • Repeat
• Types of alopecia
  • Diffuse alopecia
    • Androgenetic alopecia
      • Most common cause
      • In androgen-sensitive hair follicles
        • Bitemporal scalp in men
        • Frontal scalp in women
      • Androgens shorten the anagen phase
    • Telogen effluvium
      • Endocrine disorders
      • Drugs
      • Malnutrition
      • Severe stress
  • Circumscribed alopecia
    • Alopecia areata
      • Autoimmune
      • Bacterial infection
      • Stress
    • Syphilitic alopecia
    • Scarring alopecia
      • Trauma
      • Burn
      • Ulcerating skin diseases
• Treatment
  • Finasteride
  • Minoxidil
  • Hair transplant
  • PUVA
  • Imiquimod
  • Tacrolimus
  • etc.