Use cotton wool:

• Use a fine wisp of cotton or your fingers to touch the skin lightly.
  
  
• Ask the patient to respond (say "yes") whenever a touch is felt.
  
  
• Test the following areas and ask the patient to tell you if there is any asymmetry:
  
  
  1. Front of both thighs (L2)
  2. Both knees (L3)
  3. Medial and lateral aspect of both calves
     (L4 and L5)
  4. Little toes (S1)

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