Dermatoscopy in the diagnosis of tinea nigra.

Tinea nigra is an asymptomatic superficial fungal infection caused by Phaeoannelomyces werneckii, generally affecting the skin of the palms and characterized by deeply pigmented macular non-scaly patches. These lesions are quite characteristic. However, they can be misdiagnosed as a malignant melanoma or a junctional melanocytic nevus and unnecessary biopsies may be performed.

Cat-transmitted cutaneous lymphatic sporothricosis.

Sporotrichosis is the most common of the deep mycoses. In most cases the transmission occurs secondary to recent penetrating trauma with plant thorns, wood splinters or contaminated organic material. We report a case of a 68-year-old Brazilian female with a small ulcer on her right forefinger and palpable erythematous nodules on her right forearm.