ABSTRACT
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. Thus, dermoscopy is a fast, useful, clinical adjunctive tool in differentiating tinea nigra from melanocytic lesion.
Subject(s)
Dermoscopy , Hand Dermatoses/diagnosis , Tinea/diagnosis , Antifungal Agents/therapeutic use , Ascomycota/isolation & purification , Child , Diagnosis, Differential , Hand Dermatoses/drug therapy , Hand Dermatoses/microbiology , Humans , Male , Melanoma/diagnosis , Melanosis/diagnosis , Miconazole/analogs & derivatives , Miconazole/therapeutic use , Mitosporic Fungi/isolation & purification , Skin Neoplasms/diagnosis , Tinea/drug therapy , Tinea/microbiologyABSTRACT
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. These occurred after the bite of a domestic cat that had a lesion on its hind-foot. Since the 1980s, the role of felines in the transmission of this mycosis to humans has gained attention among animal owners, veterinarians, and caretakers. Humans can be contaminated by a cat scratch or bite and even by contact with contaminated solutions.
