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Human hair has a protective lipid layer that can be damaged by moisture and treatments, affecting hair growth and health.

We don't fully understand how sunlight damages different types of hair.

Visible light can damage skin and most sunscreens don't block it well; more research is needed on its effects and protection methods.

Permanent makeup can cause delayed allergic reactions, but they can be managed with proper treatment.

Oxidation changes human hair by breaking down fats and forming new acidic groups, affecting how it interacts with conditioners and cosmetics.

Hair with more melanin resists weather damage better.

UV radiation significantly damages hair, especially with humidity, making it more vulnerable to further damage.

Genetically variant peptides are reliable for forensic identification despite age-related changes in hair proteins.

Lasers and light sources can effectively remove hair, work best on fair skin with dark hair, and usually need multiple treatments.

Skin reactions to antidepressants are common but usually not serious and can be treated.

Taking hormonal contraceptives can cause skin changes, including hair loss, due to the effects of synthetic sex hormones.

Blue light therapy is safe for skin and may protect against UV radiation.

Hair texture changes with age due to varying levels of lipids.

Women's hair gets thinner and grayer as they age, with treatments available for hair loss and graying.

Hair treatments cause significant structural changes, especially with excessive heat, regardless of ethnicity.

Relaxer treatments damage African–American hair, with commercial products causing more harm than lab-made solutions.

Hair loss treatments work better with lifestyle changes.

ATG effectively reduces hair frizz without damaging hair strength.

Different types of sun exposure damage skin cells and immune cells, with chronic exposure leading to more severe and lasting damage.

Activating Nrf2 helps wounds heal faster by increasing hair follicle stem cells.

Photobiomodulation therapy helps manage cancer treatment side effects but needs more research for optimization.

The hydrogel helps reduce scarring and improve wound healing by releasing salvianolic acid B in acidic conditions.

Fzd2 is important for skin and hair development through various signaling ways.

As skin cells mature, vitamin D receptor levels decrease while retinoid X receptor α levels increase.

Older hair follicle stem cells have a reduced ability to renew themselves, leading to more hair loss.

Outside factors like grooming, chemicals, and the environment can damage hair and cause disorders.

Some skin diseases and anaemia are related, and treating the skin condition can often improve the anaemia.

Both Th1 and Th2 immune responses are increased in alopecia areata, with Th2 response more strongly linked to how severe the disease is.

Topical tofacitinib is effective in promoting hair growth for non-scarring alopecia.

Hydroxypinacolone retinoate is a potent anti-aging ingredient for skin that is more effective and less irritating than other forms of retinoids.