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Alopecia areata is likely caused by a combination of genetic factors and immune system dysfunction, and may represent different diseases with various causes.

Stress-related substance P may lead to hair loss and negatively affect hair growth.

Hyperpigmentation is common in pregnancy and may not fully fade after birth; melasma, also frequent, can persist but has limited treatment options during pregnancy.

Special and immunohistochemical stains are not routinely needed for diagnosing hair disorders.

Age affects how certain proteins involved in COVID-19 infection are expressed in mice, but sex hormones and heart injury do not.

Skin problems in COVID-19 patients are rare and may be due to the body's complex immune response or blood clotting issues.

AGA causes hair loss by shrinking hair follicles due to DHT binding, and can be treated with finasteride and minoxidil.

Only skin melanocytes, not other types, can color hair in mice.

Calcipotriol plus betamethasone with microneedling works better than tacrolimus for treating vitiligo.

Using CRISPR for gene editing in the body is promising but needs better delivery methods to be more efficient and specific.

Wound dressing absorbs fluid, regenerates hair follicles, and heals skin burns.

Stressed fibroblasts greatly increase melanin production in hair, skin, and eye cells, mainly due to a growth factor called bFGF.

Metformin and rosiglitazone improve blood vessel function in women with PCOS, with metformin also reducing insulin resistance and testosterone levels.

Cat color patterns are determined early in development by gene expression and epidermal changes, with the Dickkopf 4 gene playing a crucial role.

Ultraviolet rays damage hair, smoking may cause hair loss, and good nutrition is important for hair health, but genetics mainly decide hair thickness.

Disrupted sleep patterns can harm skin and hair cell renewal, but melatonin might help.

Some alternative therapies for vitiligo show promise but need more research.

The book details skin conditions in older adults, their link to mental health, cancer treatment importance, hair loss remedies, and managing autoimmune and itchy skin.

The document concludes that the development of certain tumors is influenced by genetic background and that a specific gene modification can lead to tumor regression and reduced growth.

Hair elemental analysis could be useful for health and exposure assessment but requires more standardization and research.

MSC-Exos can aid organ development and offer therapeutic benefits for various conditions.

Hair ages due to various factors and treatments like minoxidil and finasteride can help, but more research and better public awareness are needed.

Gene therapy shows promise for treating skin disorders and cancer, but faces technical challenges.

Hair color production is closely linked to the active growth phase of hair in mice and may also influence hair growth itself.

Aged individuals heal wounds less effectively due to specific immune cell issues.

Oxidative stress contributes to hair graying and loss as we age.

Stress increases nerve fibers and immune cell activity in mouse skin, possibly worsening skin conditions.

Skin cell-derived vesicles can help heal skin injuries effectively.

The "Two-Cell Assemblage" assay is a new, simple method to identify substances that may promote hair growth.

Proper control of β-catenin activity is crucial for development and preventing diseases like cancer.