dermatomycosis dermatomycosis a dermatomycosis is a skin disease caused by a fungus. this excludes dermatophytosis. dermatomycosismicrograph of a superficial dermatomycosis. the fungal organisms are the dark staining, thick, quasi-linear objects below with skin surface. vulvar biopsy. gms stain.specialtyinfectious diseases symptomsthese fungal infections impair superficial layers of the skin, hair and nails. examples of dermatomycosis are tinea and cutaneous candidiasis.these fungal infections impair superficial layers of the skin, hair and nails.