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Testosterone and dihydrotestosterone affect hair growth, and new techniques like the folliculogram help study it, but fully understanding hair growth is still complex.

Hormones, nutrition, and seasonal changes regulate hair growth cycles, with androgens extending growth phases and factors like aging and malnutrition affecting hair loss and thinning.

Spironolactone is better than placebo for reducing excessive hair growth in women, but its effectiveness for acne is unclear due to small study sizes.

Finasteride works better for hair loss in patients 26 or younger.

Hair analysis showed very high metformin levels in two fatal overdose cases, suggesting it's useful in forensics but sweat may affect results.

African hair has the most lipids, while Caucasian hair is more hydrated and stronger.

Anti-androgens are effective for female acne but less so for male-pattern hair loss, with side effects similar to birth control pills.

People distressed by minor skin changes should consult dermatologists with cosmetic expertise, and a public Cosmetic Dermatology Service with mental health support is recommended.

Androgens can cause hair growth in some areas and hair loss on the scalp.

Probiotic bacteria improved skin and hair health in aged mice.

Advanced human skin models improve drug development and could replace animal testing.

Men's thigh hair grows longer and has a longer growth cycle than women's, but arm hair growth is similar between genders.

Oxidative stress is a key factor in the development of Polycystic Ovary Syndrome, and weight management can improve symptoms.

Hormone imbalances can cause specific skin changes, which may help in early detection of endocrine disorders.

Cyproterone acetate is effective for treating hirsutism and acne but less so for hair loss, with side effects similar to birth control pills.

Cyproterone acetate reduced hair growth in most hirsute females and made hair softer, thinner, and lighter.

Spironolactone did not make hair thinner in women with excess hair growth.

The Brazilian Society of Dermatology agrees that oral isotretinoin is effective for acne and other skin conditions, and it's safe when monitored, but more research is needed on dosing and duration.

Cyproterone acetate is effective for treating hirsutism, but some patients may feel worse on low-dose maintenance therapy.

Hair in mammals likely evolved from glandular structures, not scales.

Plant-based remedies may treat hair loss by reducing inflammation and improving insulin resistance.

Finasteride side effects in young men may be linked to specific gene variations.

Botulinum toxin's effectiveness for treating scalp alopecia is not well-supported due to insufficient data.

Current research explores hair growth drugs, while future research aims for personalized treatments.

Most skin rashes in rheumatoid arthritis patients were not caused by their medication, and careful evaluation allowed most to keep taking their beneficial treatment.

ADT-G may be a useful indicator of increased androgen levels in women with acne and can be lowered with certain birth control pills.

The document emphasizes the need for primary care providers to understand and care for African American children's hair and skin to boost their self-esteem.

N-acetyl-cysteine shows promise in treating various diseases and may improve skin and hair conditions, but more research is needed on dosages and long-term effects.

Polycystic Ovary Syndrome (PCOS) is a hormonal disorder in women that can cause infertility and other health issues, and it may be improved by treatments that increase insulin sensitivity.

Hair analysis is better than urine and blood for detecting past drug use.