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A woman with severe hair loss regrew mostly white hair after treatment.

A 73-year-old man's grey-white hair turned dark brown after eczema treatment.

Bleaching hair changes its structure and weakens it, which is important for understanding hair damage and creating treatments.

Coloring white hair before IPL treatment effectively helps remove it.

Vitamin B12 deficiency can cause skin and hair color changes, which can be reversed with treatment.

Minoxidil can cause hair to turn yellow.

The immune system can cause permanent skin and hair whitening by attacking pigment cells.

Premature hair whitening or loss may indicate a risk for erectile dysfunction.

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

COVID-19 might cause gray hair to regain color.

White hair regrowth in alopecia areata may be more common than thought.

White hair from alopecia areata can turn pigmented after treatment.

Chemical treatments on bleached black hair change its internal structure by breaking and reforming bonds, and treatments with hydrolyzed eggwhite protein help repair it.

White hair is denser and more hydrophobic than black hair.

Bleaching damages hair the most, while dyes improve combability but still cause protein loss.

Some medications can cause rare hair color changes, and reporting these side effects is important for patient quality of life.

Blond hair lightens more with visible light directly, while ultraviolet light lightens it after washing by damaging other hair parts.

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

Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.

Bleaching hair removes its protective top layer and exposes more hydrophilic groups, changing its chemical surface and affecting how it interacts with products.

Hair with more melanin resists weather damage better.

Bleaching hair twice makes it very dry and weak.

Effective treatments for premature hair graying still require significant research.

Bleaching hair damages protein structure, especially keratin, leading to weakened hair.

UV radiation damages hair similar to bleaching, but double bleaching causes more severe protein degradation.

White hair has less lipid content and absorbs water differently than brown hair.

A woman's hair turned gray and fell out after starting a cancer drug called imatinib mesylate.

Ketoconazole shampoo can cause rare pink hair discoloration.

A 14-year-old girl's black hair showed unique color changes, suggesting early greying.