Abstract
Longitudinal melanonychia striata, presenting as a black linear vertical band of the nail plate, can be caused by pigmented lesions and non-pigmented etiologies. A fungal infection of the nail plate, also referred to as onychomycosis or tinea unguim, can result from dermatophytes, non-dermatophyte molds, and Candida. Albeit rare, Candida-associated fungal melanonychia can present as a longitudinal black nail plate streak. The case of a 79-year-old man who developed a solitary linear black streak on his right fourth fingernail after a prior history of recent trauma to the digit’s nail folds is described; the fungal culture grew Candida parapsilosis. Including our patient, Candida-associated longitudinal melanonychia striata has been described in four women and two men ranging in age from 40 to 79 years (median, 70 years) at diagnosis. The black streak, present from one month to one year (median, seven months), affected either a hand digit (five patients) or the great toe (one patient). Fungal organisms were visualized on either a potassium hydroxide preparation (one patient), pathologic evaluation of a nail plate specimen (three patients), or both (one patient). Culture grew Candida parapsilosis (two patients), Candida species (two patients), Candida albicans (one patient), and Candida tropicalis (one patient). All of the patients experienced clinical improvement after treatment. Topical treatment (5% amorolfine hydrochloride nail lacquer for two patients or modified Castellani paint and 1% clotrimazole cream for one man) or oral itraconazole (either as monotherapy for two women or combined with 5% amorolfine hydrochloride nail lacquer for one woman) was successfully used. Although the clinical presentation of fungal melanonychia can mimic subungual melanoma when it appears as a solitary black linear vertical nail plate streak, investigative studies--such as a potassium hydroxide preparation, nail plate pathology, nail matrix biopsy, and/or fungal culture--can be used to establish the diagnosis of Candida-associated longitudinal melanonychia striata and exclude the diagnosis of a pigmented melanocytic tumor.
Highlights
He was treated topically twice daily with modified Castellani paint and 1% clotrimazole cream; both medications were applied to the affected nail plate and the adjacent lateral nail fold
Distant (a) and closer (b) views of the right fourth distal finger demonstrate complete clearing of the linear fungal melanonychia after three months of twice daily topical treatment with modified Castellani paint and 1% clotrimazole cream
Candida-associated fungal melanonychia can present as a longitudinal black nail plate streak
Summary
The clinical presentation was suggestive of a diagnosis of longitudinal melanonychia striata He was treated topically twice daily with modified Castellani paint (a solution that consists of phenol, acetone, resorcinol, alcohol, and water) and 1% clotrimazole cream; both medications were applied to the affected nail plate and the adjacent lateral nail fold. The pigmented streak completely cleared after three months of daily treatment and the agents were discontinued Followup evaluation of his right fourth fingernail, two months after stopping the medications, showed a normal nail plate without black dyschromia (Figure 2). Distant (a) and closer (b) views of the right fourth distal finger demonstrate complete clearing of the linear fungal melanonychia (which had been present in the area within the black oval) after three months of twice daily topical treatment with modified Castellani paint (a solution that consists of phenol, acetone, resorcinol, alcohol, and water) and 1% clotrimazole cream
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