A 60-year-old patient develops a green-black to green-blue discoloration of one of her toenails. You suspect she may have green nail syndrome. Which of the following is not a predisposing factor to the development of green nail syndrome?

A. Excessive use of detergents

B. Excessive use of soaps

C. Nail trauma

D. Melanocytic nevus

E. Frequent and prolonged exposure to water

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