Hair colour can be a biomarker of some diseases (hypopigmentation), so it is important to know the geographical distribution of some clinical traits with a genetic basis.

Pervasive pigmentation disorders.
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Tey H. A Practical Classification of Childhood Hypopigmentation Disorders. Acta Derm Venerol [Internet]. 2010 [cited 2023 Mar 1];90(1):6–11. Available from: https://medicaljournalssweden.se/actadv/article/view/7578
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1.
The genetic causes, ethnic origins and history of red hair - Eupedia [Internet]. 2023 [cited 2023 Mar 1]. Available from: https://www.eupedia.com/genetics/origins_of_red_hair.shtml

In oculocutaneous albinism, depending on the intensity of the enzyme deficit and the underlying genetic problem, there may be different shades of color that reach red hair or brown hair, so the phenotypic spectrum is very broad.

Phenotypic variability of albinism.
Ruffous albinism (red). GOOSE type 3.
albinoidism

There is a group of syndromes that produce a phenotype similar to that of oculocutaneous albinism and that are part of the differential diagnosis with it.

Acquired hair color disorders.
Deposed child syndrome
Disorders with focal hypopigmentation.
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1.
Tey H. A Practical Classification of Childhood Hypopigmentation Disorders. Acta Derm Venerol [Internet]. 2010 [cited 2023 Mar 1];90(1):6–11. Available from: https://medicaljournalssweden.se/actadv/article/view/7578