II. Causes

  1. Pruritic Conditions
  2. Third trimester of pregnancy
  3. Following Scabies treatment

III. Pathophysiology

  1. Abnormal autonomic reflex response to allergen

IV. Technique

  1. Stroke skin of back with blunt object (Tongue blade)

V. 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

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