Disseminated Eczema (Autosensitization / Id reaction)

  • 2/3 of allergic contact dermatitis with stasis dermatitis

Exact pathogenesis unknown,

Possibly due to:

  • – Hematogeneous spread of allergen
  • – Activated memory T cell

  • Days-weeks after first lesions
  • Symmetric distribution
  • Poorly demarcated eczematous patches
  • Mainly affects:
  • Extensors of lower and upper extremities
  • Palms
  • Soles

Associations:

  • Allergic contact dermatitis
  • Stasis dermatitis
  • Other forms of eczema
  • Severe tinea pedis

  • Findings of acute/subacute dermatitis

  • Systemic corticosteroids 
  • Topical corticosteroids
  • Systemic antihistamines
  • Treatment of underlying dermatosis (prevent recurrences or flares)