Which form occurs exclusively in South America and involves skin and mucosal tissue?

• A. Cutaneous
• B. Mucocutaneous
• C. Visceral
• D. Diffuse Cutaneous

Answer: (B)

This form of leishmaniasis is defined by involvement of both skin and mucous membranes, with a geographic pattern linked to South American cases caused by New World parasite species. It typically begins with a skin lesion, but the infection can spread and destroy mucosal tissues in the nose, mouth, and throat, leading to serious, progressive ulcers. That combination of skin plus mucosal involvement is the hallmark distinguishing this form from others. By contrast, disease confined to the skin only lacks mucosal damage; visceral disease affects internal organs like the liver and spleen; and a diffuse cutaneous form presents as widespread skin lesions without mucosal involvement.