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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.

The document concludes that early diagnosis and treatment are crucial for children with hair loss to prevent permanent damage, although not all conditions can be effectively treated.

Gonadal hormones significantly affect the severity of alopecia areata in mice.

Immune cells help regulate hair growth, and better understanding this can improve hair loss treatments.

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

People with lichen planus are more likely to have dyslipidemia, especially higher triglyceride levels.

Longer hair loss leads to more severe CCCA; early treatment and avoiding damaging hairstyles help regrowth.

Horizontal sections of scalp biopsies are good for diagnosing Central Centrifugal Cicatricial Alopecia and help customize treatment.

A young man was initially misdiagnosed with a scalp condition but was found to have a fungal infection, which improved with antifungal treatment.

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

Hair root sheaths are more common in non-scarring hair loss and help diagnose the type of hair loss.

Eyebrow loss has many causes and requires accurate diagnosis for proper treatment.

Most hair loss in captive rhesus macaques is likely due to environmental and behavioral factors.

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

Genetic marker rs12558842 strongly linked to male hair loss.

At least 87% of Indian men experience hair loss, with type II being most common and severity increasing with age.

Three white adults had a rare scalp condition with increased fat and sometimes hair loss, suggesting it's not limited to black women and might be more widespread.

Minoxidil may cause heart changes; use caution and monitor patients with heart conditions.

COVID-19 can cause skin issues like chilblains and rashes, which may help in early detection, especially in patients without other symptoms.

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

iNKT cells can help prevent and treat alopecia areata by promoting hair regrowth.

Patients with GATA2 deficiency show early skin symptoms that help diagnose the condition.

Certain microRNAs are linked to various skin diseases and could be used to diagnose and treat these conditions.

The study suggests that acne keloidalis nuchae is linked to conditions like pseudofolliculitis barbae, scalp infections, metabolic syndrome, and is more common in males with an average onset age of 25.4 years.

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

Female donor to male recipient sex mismatch and positive ACA-IgG are key risk factors for vitiligo and alopecia areata in chronic GvHD patients.

Hepatitis C virus can cause skin diseases and dermatologists play a crucial role in identifying these conditions.

Some patients may experience temporary total hair loss from hepatitis C treatment with PEG-interferon and ribavirin.

Hair loss in cancer patients can be related to the cancer itself, treatment, or other conditions, and understanding it is important for diagnosis and patient care.

Some patients receiving pegylated interferon alfa injections developed skin necrosis, requiring treatment adjustments or discontinuation.