Melanosis is a medical condition that refers to the abnormal accumulation of the dark pigment melanin in the body. There are several synonyms for melanosis, including melanoderma, melanocytic hyperplasia, and pigmented lesion. Melanoderma refers to a darkening of the skin due to melanin pigment buildup, while melanocytic hyperplasia indicates an increase in the number of melanin-producing cells in the body. Pigmented lesion is a broader term used to refer to any area or spot on the skin that is darker than the surrounding skin due to melanin buildup. Synonyms for melanosis are commonly used in medical contexts to describe skin discolourations, growths, or lesions that may be of concern to patients.