Phototherapy

• Indications
  • Psoriasis
  • Atopic dermatitis
  • Alopecia areata
  • Granuloma annulare
  • Cutaneous T-cell lymphoma
  • Vitilligo
  • Photodermatoses
  • BCC
  • Actinic keratosis
• Mechanisms
  • Thickens epidermis
  • Hyperpigmentation
  • Immunosuppressive effect
  • Anti-tumor effect
• Procedure
  • Minimal erythematous dose (MED) is determined
  • The dose of UV light depends on the MED
• Types
  • Narrow-band UVB
  • Broad-band UVB
  • Selective UVB
  • Psoralen + UVA
  • Photodynamic therapy
    • Uses visible light, not UV
    • For cancers that are caused by UV (BCC)