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The skin systems of jawed vertebrates evolved diverse appendages like hair and scales from a common structure over 420 million years ago.

Hair cortisol is a reliable stress indicator in cattle but may not be valid for pigs.

Scientists turned mouse stem cells into skin cells that can grow into skin layers and structures.

The skin has multiple layers and cells, serves as a protective barrier, helps regulate temperature, enables sensation, affects appearance, and is involved in vitamin D synthesis.

Pregnancy can cause skin changes and may affect pre-existing skin conditions, with some treatments not safe for use during pregnancy.

Aging reduces the ability of human hair follicle cells to form new cell colonies.

Mummy hair from the Taklamakan desert has calcium and phosphorus inside.

Long-term testosterone therapy can cause hormone suppression, affect prostate and heart health, and alter physical characteristics, but does not increase prostate cancer risk and needs more research for full risk assessment.

Aging can lead to poorer scalp and hair health, including less hair and more scalp diseases, which should be managed to help older people feel better.

The interdigital gland in crossbred sheep is similar to skin and has specialized structures for secretion.

Most vertebrates can regenerate skin, nails, and corneas, but only some can regenerate teeth and lenses.

Hair can accurately predict iron levels in cattle muscle, helping diagnose mineral imbalances.

Human hair has a new region with ordered filaments and the cuticle contains β-keratin sheets.

Taking too much biotin can mess up blood test results, which might lead to wrong diagnoses and treatments.

Surface and internal treatments can help prevent hair lipid loss during washing.

True facial beauty is natural, but cosmetic procedures can enhance it temporarily.

Testosterone therapy can help with androgen deficiency in women but should be used with caution and monitoring due to potential risks.

The wolves suspected of man-eating in the 1880s likely ate very little human flesh and mostly consumed a diet similar to herbivores and omnivores.

The method can help diagnose and monitor diabetes by analyzing hair.

Hormones like estrogen, testosterone, progesterone, and prolactin play complex roles in female sexual function, with testosterone potentially improving sexual desire, arousal, and satisfaction. However, more research is needed to establish safe and effective hormone treatments for female sexual dysfunction.

The document explains how hair loss patterns in men and women, known as Androgenetic alopecia, are classified using the Hamilton-Norwood system for men and the Ludwig grade system for women.

Combining topical dutasteride with microneedling is more effective for hair growth than microneedling alone.

PRP treatment helps hair growth and density with 70.7% success, but more research needed.

Androgenetic alopecia is common, affects self-image, and has no complete cure yet.

Androgenetic alopecia, a common hair loss condition, can be treated with topical minoxidil, oral finasteride, or oral spironolactone, and new treatments like platelet-rich plasma, low-level laser therapy, and janus-kinase inhibitors are being explored.

Hair loss in male pattern baldness is linked to changes in immune cell behavior around hair follicles.

In the Jazan region of Saudi Arabia, hair loss is common, especially among women, older people, and those with higher education and BMI. Stress, poor nutrition, and hormonal changes are key causes, but many don't seek medical help.