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Human skin can make serotonin and melatonin, which help protect and maintain it.

The Endocrine Society advised against routine testosterone therapy for women, citing a need for more research on long-term safety and a clear definition of androgen deficiency.

The guidelines advise against using testosterone and DHEA in women for most conditions due to safety and effectiveness concerns, but suggest considering testosterone for postmenopausal women with low sexual desire.

Some patients taking finasteride or dutasteride may have ongoing sexual problems and depression even after stopping the medication.

Melatonin may help with sleep issues, depression, and cancer, but more research is needed.

Androgens can both increase and decrease hair growth in different parts of the body.

Testosterone therapy in transgender men has both desired effects like increased muscle mass and potential health risks such as higher cardiovascular risk.

Estrogen therapy can reduce skin aging but has cancer risks.

The dermal papilla is crucial for hair growth and health, and understanding it could lead to new hair loss treatments.

Surgeons must understand the full care process for gender confirmation surgery to help transgender individuals effectively.

A simple screening method found that 6.3% of women in a semiurban area in Sri Lanka have polycystic ovary syndrome, with most showing menstrual irregularities.

Estrogens help reduce skin aging, and SERMs might offer similar benefits without the risks of hormone therapy.

Animals that change color with the seasons mainly do so in response to daylight changes, but climate change is causing camouflage problems that may require evolutionary changes.

More men are getting benign prostatic hyperplasia, and there are many treatments, from medication to surgery, with new methods being developed.

Melatonin helps regulate hair growth and protects the hair follicle from stress.

Drospirenone is a unique progestin with anti-water retention and potential blood pressure benefits, used in birth control and hormone therapy.

Minoxidil and finasteride effectively treat hair loss.

Testosterone therapy seems safe for postmenopausal women for a few years, but more research is needed for long-term effects.

New treatments for male hypogonadism are effective and should be personalized.

After menopause, women lose a lot of skin collagen, but estrogen replacement might improve skin health.

Beta-sitosterol has potential health benefits but needs more research to fully understand its effects and improve its use in treatments.

5α-reductase inhibitors can cause sexual problems, higher risk of aggressive prostate cancer, and depression.

The document concludes that for hair and feather growth, it's better to target the environment around stem cells than the cells themselves.

Hair growth is influenced by interactions between skin layers, growth factors, and hormones, but the exact mechanisms are not fully understood.

The review recommends hormone replacement therapy for women with premature ovarian insufficiency to manage symptoms and protect health, with specific approaches for different groups.

PLGA-based microneedles are promising for safe and effective skin delivery of drugs and vaccines.

The document concludes that electrolysis and thermolysis can permanently remove hair but calls for better regulation to ensure safety, and notes a possibility of hair regrowth and rare complications.

Nanocarrier-loaded gels improve drug delivery for cancer, skin conditions, and hair loss.

Prolactin slows down hair growth in mice.

Some medications can cause acne, and stopping these drugs is the main treatment.