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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.

Monitoring steroid hormones in blood can better detect testosterone doping.

Tiny natural vesicles from cells might help treat hair loss.

Researchers found markers that can tell if hair has been bleached, which could improve hair test accuracy.

Hair color and length affect metabolite profiles in hair, so they should be considered in hair analysis.

Ro stress hindered ginseng root growth and ginsenoside production, but increased certain hormones and affected gene regulation related to plant growth and stress responses.

A certain medication improved severe itching in a boy with liver and bowel disease by reducing histamine levels, suggesting a new treatment target.

High doses of fluconazole can cause reversible hair loss.

Testosterone therapy for postmenopausal women appears safe and may protect against heart disease, but requires constant monitoring and more research for long-term effects.

New UVA-responsive nanocapsules effectively kill microorganisms in hair follicles when activated by light.

Dutasteride may help protect neurons and reduce inflammation in Parkinson's disease.

Acetylcholine receptors might be involved in the development of acne inversa and smoking could worsen the condition.

Anabolic-androgenic steroids harm male hormone levels, sperm, metabolism, and can cause acne, hair loss, and breast growth.

Men and women react differently to opioids, with hormones potentially influencing these differences.

A young man had a rare case of hair cysts on his elbows, which was hard to diagnose and treat.

ROR-alpha may increase the growth of certain breast cancer cells by boosting aromatase, which could affect breast cancer prognosis.

Estrogen and its receptors play a key role in hair growth, with differences between males and females.

Human enzymes can detoxify harmful substances but might also increase their cancer risk.

A specific RNA increases hair stem cell growth and skin healing by affecting a protein through interaction with a microRNA.

miR-29a-5p prevents the formation of early hair structures by targeting a gene important for hair growth and is regulated by a complex network involving lncRNA627.1.

New gene mutations linked to skin conditions were found, bacteria and chemicals may worsen acne, a dog mutation could exist in humans, virus-like elements might be involved in psoriasis, and a vitamin D3 treatment doesn't prevent chemotherapy-related hair loss.

JAM-A helps hair regrowth in alopecia areata by protecting VCAN in skin cells.

Formyl-peptide receptor agonists could be new anti-inflammatory drugs.

Neurosteroids can influence behavior by modulating brain inhibition, with potential for treating psychiatric disorders.

PTHrP is important for bone formation and may be targeted for osteoporosis treatment and longevity therapies.

Drugs can be incorporated into hair based on their chemical properties and hair pigmentation.

Melatonin is good for skin health and may help treat skin conditions.

Controlled light treatment in mouse skin speeds up healing and hair growth.

New treatments for hair growth and psoriasis may be possible, and gene differences could affect baldness and the severity of skin conditions.

R-spondin2 may help treat hair loss, gene differences could explain baldness, a peptide's regulation is linked to psoriasis, B-defensin gene copies may affect a skin condition's risk and severity, and potential markers and targets for alopecia areata were identified.