Why is it so tempting to pick a scab?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts
  
  

Footballer with cut and muddy knees

Why is it so tempting to pick a scab? Our bodies create them to help wounds heal, yet those same bodies make us want to remove them. Tabitha Stubbs, Liverpool

Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published next Sunday.

 

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