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Annular lichenoid dermatitis (of youth)

  • Primarily affects children and young adults (up to 45 years old)

  • Unknown

  • Erythematous macules 🡪extend into 5-15 cm annular red-brown patches with non-scaly border and central hypopigmentation 
  • Involve groin and flanks; solitary or multiple 
  • Chronic course but some lesions resolve spontaneously

  • Papillary band-like lymphocytic infiltrate + basal vacuolization
  • Lymphocytic epidermotropism
  • Rete ridge squaring & apoptotic keratinocytes at rete ridge tips
  • Normal number of melanocytes

  • Mycosis fungoides
  • Inflammatory vitiligo

  • Systemic corticosteroids
  • Topical corticosteroids
  • Phototherapy