Exam

Dermatographism

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Dermatographism, Dermatographia

  • See Also
  1. Urticaria
  • Causes
  1. Pruritic Conditions
  2. Third trimester of pregnancy
  3. Following Scabies treatment
  • Pathophysiology
  1. Abnormal autonomic reflex response to allergen
  • Technique
  1. Stroke skin of back with blunt object (Tongue blade)
  • Interpretation
  1. Normal response: White line
    1. Faint pale line along stimulation path
  2. Abnormal response: Red line
    1. Mild: Bright red line with red mottling extension
    2. Exaggerated: Wheal with raised, edematous, pale skin