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

Removing Dicer from pigment cells in newborn mice causes early hair graying and changes in cell migration molecules.

Hair graying is caused by the loss of pigment cells due to poor maintenance of stem cells in the hair follicle.

Hair color is due to active pigment cells in hair during growth.

Oxidative stress causes hair to gray by damaging and killing pigment cells.

Stress can cause hair to turn gray by depleting pigment-producing cells through the release of a stress hormone.

Mouse hair follicles age, causing more white hairs due to fewer pigment stem cells.

Butyrate helps hair grow longer, improves hair cell health, increases pigment production, and boosts hair's natural defenses.

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

Hair and nail disorders can cause changes in scalp pigmentation, especially with sun exposure and alopecia.

Cathepsin L is essential for normal hair growth and development.

Finding eosinophils near hair bulbs helps diagnose alopecia areata.

Children with marasmus have more resting hair follicles and thinner, less pigmented hair, showing long-term malnutrition.

Hair graying may be caused by stem cell depletion from stress or melanocyte damage.

mTORC1 activity is important for hair growth and color, and targeting it could help treat hair loss and greying.

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

Hair color is influenced by genetics and can indicate certain health conditions.

The patient's hair loss is most likely due to diffuse alopecia areata.

Scalp micropigmentation is a successful, non-surgical way to make hair look fuller.

Scalp micropigmentation is a tattooing method that can mimic a full head of hair without surgery and has no healing time.

The boy had trichotillomania, causing hair loss, and treatment focused on habit reversal and support.

UV light can help stimulate the growth of new pigment cells from hair follicles in people with vitiligo.

A man's chest hair turned white after a shingles infection, possibly due to virus-damaged pigment cells.

Constant light exposure during pregnancy changes newborn rabbits' skin, affecting hair follicles, skin thickness, and pigment cells.

Cationic and nonionic surfactants provide better color intensity and resistance for semi-permanent hair dye than anionic surfactants.

New hair after alopecia areata can be thinner and change color but usually keeps the same shape.

The document summarizes recent dermatological treatments and advances in areas like pediatric care, wound healing, skin closure, light-based therapies, pigment disorders, hair loss, immunotherapy, infection management, melanoma, drug reactions, and facial rejuvenation.

Different melanocyte types in hair follicles either survive or die during the catagen phase.

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

The study found specific hair and scalp patterns for different types of hair loss in Koreans, noting racial differences affect diagnosis.