👉 Melanuria is a condition where there are excessive amounts of pigment in the skin, usually due to an overproduction of melanin. This excess melanin can cause discoloration and uneven pigmentation in various parts of the body, including the eyelids, mouth, nose, and feet. Melanuria occurs primarily in individuals who have undergone chemotherapy or radiation therapy for cancer treatment. The pigment produced by melanocytes (melanin-producing cells) is responsible for the visible yellowing of the