Congenital leucoderma is a medical condition characterized by the absence of pigmentation in the skin, hair, and eyes. Some antonyms for congenital leucoderma include hyperpigmentation, melanism, and melanogenesis. Hyperpigmentation refers to a medical condition where the skin produces an excess of melanin resulting in the darkening of the skin, hair, and eyes. Melanism refers to a condition where the skin, hair, and eyes are darkened beyond the normal level of pigmentation. Melanogenesis, on the other hand, refers to the process of producing melanin, which gives color to the skin, hair, and eyes. These antonyms describe a normal functioning of the body's melanin production, unlike congenital leucoderma where pigmentation is absent.