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A nail deformity is described which is not uncommon and is produced by frequent minor traumata, the result of playing with the nails (usually the thumb nails) with one of the other fingers of the same hand.
SAMMAN PD. A Traumatic Nail Dystrophy Produced by a Habit Tic. Arch Dermatol. 1963;88(6):895–896. doi:10.1001/archderm.1963.01590240219035
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