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Amenorrhea is when a woman doesn't have periods, with primary amenorrhea starting by age 15 or within five years of breast development, and secondary amenorrhea when periods stop for three months. It affects 3-4% of women not pregnant, breastfeeding, or in menopause, mainly due to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, and ovarian failure.

Hair loss due to syphilis can be identified using trichoscopy and is treatable with antibiotics.

Gata6 is important for protecting hair growth cells from DNA damage and keeping normal hair growth.

ΔNp63α stops TAp73β from working in skin cancer by blocking its access to specific genes, not by directly interacting with it.

The new formulation improved the skin absorption of the drug Thiocolchicoside.

Diagnosing hair loss disorders needs clinical, dermoscopic, and histological differences, and checking menstrual cycle, weight changes, drug therapy, and nail changes.

Hair disorders are caused by a complex mix of biology, genetics, hormones, and environmental factors, affecting hair growth and leading to conditions like alopecia.

The document concludes that menopause should be seen as a natural part of aging and managed with personalized care and informed choices.

COVID-19 may cause early hair loss similar to classic temporary hair loss, with further research needed.

The document concludes that accurate diagnosis and treatment of scalp itch require differentiating between various conditions using a proposed five-step evaluation process.

Dogs could be good models for studying human hair growth and hair loss.

Prenatal stress changes how male and female rats enjoy rewards differently, linked to sex hormones.

New lipid nanoparticles show promise for delivering hair loss treatments but need improvement for better skin penetration.

Different markers are found in stem cells of the scalp's hair follicle bulge and the surrounding skin.

Sp6 promotes tooth development by reducing follistatin levels.

A gene deletion causes the "hairless" trait in Iffa Credo rats.

Senescent melanocytes can boost hair growth by activating hair stem cells.

Immune cells affect hair growth and could lead to new hair loss treatments.

Platelet-Rich Plasma (PRP) shows promise for hair growth and skin improvement in aesthetic surgery.

The document concludes that primary scarring alopecias cause permanent hair loss, have unpredictable outcomes, and lack definitive treatments, requiring personalized care.

Researchers created a mouse model for Cushing's syndrome to study glucocorticoid excess and potential treatments.

Ca_v1.2 affects hair growth and could be a target for hair loss treatments.

Commercial hair loss websites promote Propecia by making men feel insecure about baldness and suggesting it's a medical issue needing treatment.

Stump-tailed macaque best for researching hair loss causes and treatments.

The document says that understanding the causes of PCOS is important for treatment, especially in distinguishing the syndrome from just having cystic ovaries, and that losing weight is key for obese women with PCOS.

PBX1 helps hair stem cells grow and change by turning on certain cell signals and preventing cell death, which may be useful for hair regrowth treatments.

Endoglin is crucial for proper hair growth cycles and stem cell activation in mice.

A new liposome treatment helps heal deep burns on mice by improving hair regrowth and reducing scarring.

New method measures female hair loss: Female Pattern Hair Loss Severity Index (FPHL-SI).

Researchers created a skin treatment that could effectively deliver medication into hair follicles.