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  • Title: [Secondary longitudinal melanonychia secondary to onychophagia].
    Author: Salmon-Ehr V, Mohn C, Bernard P.
    Journal: Ann Dermatol Venereol; 1999 Jan; 126(1):44-5. PubMed ID: 10095892.
    Abstract:
    BACKGROUND: Melanonychia of the toenails sometimes results from repeated trauma. This etiology is rarely put forward in lesions affecting the fingernails. CASE REPORT: A 44-year-old woman developed melanonychia affecting 9 fingernails. Genetic predisposition and drug, hormonal or infectious causes were ruled out and we postulated that the lesions were induced by nail biting. DISCUSSION: Nail biting is known to lead to several types of lesions, including melanonychia. The lesions may sometimes disappear several months after stopping this habit.
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