#melanin deficiency

• Achromatosis — A generalized pathological condition characterized by the total absence or severe diminution of normal pigmentation within a tissue, organ, or the entire organism. In dermatology, the term describes severe states of cutaneous depigmentation (such as extreme forms of albinism or vitiligo universalis) where cells no longer produce melanin.
• Achromia — The total congenital or acquired absence of normal pigmentation of the skin, hair, or other tissues, caused by the lack or destruction of melanocytes and melanin production. This general medical term covers manifestations such as generalized albinism or completely white patches occurring in advanced vitiligo.
• Leukoderma — A congenital or acquired cutaneous pathological condition characterized by the total absence or severe and extensive diminution of normal skin pigmentation, manifesting as broad white patches or generalized depigmentation of the epidermis. This structural disorder is caused by the absence, destruction, or chronic metabolic dysfunction of melanocytes, leading to a complete halt in melanin production and resulting in extreme skin sensitivity to ultraviolet radiation.
• Achromotrichia — A pathological condition or biological phenomenon characterized by the total loss or congenital absence of natural pigment within the hair shaft structure, leading to complete whitening or discoloration. This structural dermatological process is caused by the cessation of melanin production by the melanocytes within the hair follicle, and can be triggered by hereditary factors, severe nutritional deficiencies (such as a lack of copper or pantothenic acid), intense oxidative stress, or autoimmune disorders.
• Albino — A person, animal, or plant affected by albinism; characterized by the total or partial congenital absence of melanin pigment from the skin, hair, and eyes, resulting in a white or very light coloration and pink or pale blue irises.
• Albinism — A congenital anomaly characterized by the total or partial absence of melanin pigment in the skin, hair, and eyes, causing a whitish appearance of the body and extreme sensitivity to solar radiation.
• Albino — An invariable form or informal adjective, used as a modern variant or direct loanword for albino; an individual, animal, or organism affected by albinism, characterized by the congenital absence of melanin pigment, having completely white skin, hair, or fur and eyes with pinkish or light-blue reflections.
• Albino — A person or animal presenting the traits of albinism; characterized by the partial or total congenital lack of natural pigment (melanin) in the organism, which causes a very fair skin, white or milky hair, and eyes with pinkish or pale blue irises.