Microscopia eletrônica da Tinea Nigra

Abstract

Tinea nigra is a rare superficial mycosis caused by Hortaea werneckii. This infection presents as asymptomatic brown to black macule mostly in palmo-plantar regions. This study presents dermatoscopy examination of a lesion, which demonstrated a homogeneous nonmelanocytic pigmented pattern with spicules in the macula; scanning electron microscopy (SEM) examination of the fungal culture, showing sympodial conidiogenesis; and SEM examination of a sample of the lesion, that revealed the epidermis with keratinocytes, elimination of fungal filaments and important aggregation of hyphae. SEM s findings correlated with those of dermatoscopic examination and allowed also documenting the mode of dissemination of tinea nigra, showing how hyphae are eliminated on lesion s surface