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The human scalp has different types of pigment cells in hair follicles with varying abilities to produce pigment.

Surgical repigmentation can permanently restore color to white hair in vitiligo patients.

Certain drugs can change hair color, either lightening or darkening it.

White hair has weaker tryptophan fluorescence than other unpigmented fibers, possibly due to UV exposure or unknown substances.

Hair melanocytes help the skin respond to stress and regulate hair pigmentation.

Hair can darken after inflammation and then return to its original color.

Colored hair-thickening fibers can help hide hair loss in some people with Epidermolysis Bullosa but may cause scalp irritation.

The patient's hair has unique structural differences with alternating bright and dark bands.

Vitamin B12 deficiency can cause skin darkening and white hair, but it's reversible.

Some chemicals can permanently or temporarily remove color from skin and hair, which can be distressing and is not well-regulated in cosmetics.

The document concludes that while white skin, nail, and mucosa diseases increase skin cancer risk, they are generally harmless, especially compared to darker pigmentation conditions.

Minoxidil binds to hair pigment but doesn't affect hair growth.

A dark-haired Chinese girl had hair that looked banded under certain light but was normal under a microscope.

Iron can be present in hair color changes without overall iron deficiency.

Splenic eumelanin in C57BL/6 mice is different from hair eumelanin.

Sox2 controls hair color by affecting pigment production in hair follicles.

Poliosis causes white hair patches due to lack of melanin.

Melanin in black hair protects it from sun damage better than light-brown hair.

Certain genes control the color of human hair by affecting pigment production.

Daily hair care may cause holes in hair fibers.

Early hair graying is often inherited and influenced by genetics, environment, and lifestyle, but treatment options are limited.

Hair color loss can indicate the effectiveness of a drug targeting the KIT protein in mice and humans.

Gray hair may be caused by lower antioxidant activity in hair cells.

The study found markers indicating that cells responsible for hair color are differentiating in specific areas of the hair follicle.

Applying a specific inhibitor lightens skin and hair color.

Men have more tryptophan in their hair than women, and it increases with age and is higher in darker and grey or white hair.

Langerhans' cells are not involved in hair depigmentation in these mice.

The boy's hair and skin color differences are due to a pigmentation disorder.

Certain flavonoids can improve the growth of pigmented hair in mice.