👉 Melanuresis is a medical condition that refers to the presence of brown or black patches on the skin, often due to melanin production disorders. These patches are found in various parts of the body, including the face, neck, and legs. The primary cause of melanuresis is congenital melanoma, which is a type of skin cancer that begins with undiagnosed growths on the skin. Other causes include genetic mutations, autoimmune reactions, and other medical conditions like hypothy