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The effects of estrogen on human hair growth are unclear and need more research.

Hormones during pregnancy and lactation keep skin stem cells inactive, preventing hair growth.

Testosterone can slow down hair growth when combined with certain cells from bald scalps, and this effect can be blocked by an androgen receptor blocker.

Intramuscular injections improved hair density more than intradermal injections for treating hair loss.

Most dermatologic medications are safe during pregnancy and breastfeeding, but some should be avoided due to potential risks.

Plant-based ingredients in hair care are being replaced by synthetic alternatives.

Dandruff is mainly caused by a scalp reaction to yeast, can worsen hair loss, and antifungal treatments may help.

Botox increased hair count in men with baldness and might work by improving scalp blood flow.

Alopecia areata patients have more Propionibacterium acnes and less Staphylococcus epidermidis on their scalps.

Injecting hyaluronidase into the artery is effective for treating skin death and hair loss caused by hyaluronic acid fillers.

Botulinum toxin type A significantly reduces scalp psoriasis severity compared to placebo.

Human scalp hair follicles can be used to study how prolactin affects hair growth and cell death.

Lipedema is a painful fat disorder in women that's hard to treat, often worsens with hormonal changes, and requires symptom-focused therapies.

The chapter explains common scalp conditions, including infections, infestations, and tumors.

Prolactin may affect hair growth differently based on gender and scalp area.

Male pattern baldness may be caused by scalp pressure on hair follicles, which increases with age and leads to a cycle of hair loss. This process is not directly determined by genes.

The herbal supplement increased hair thickness and reduced scalp oiliness in women.

Green tea component EGCG may help prevent hair loss by changing microRNA levels in certain scalp cells.

Caffeine may help reduce stress-induced hair loss.

The best way to extract oil from Urtica dioica roots is by using corn oil, a 1:5 ratio of raw material to extract, extracting for 6 hours, and using the maceration method.

Primary essential CVG is a rare, benign scalp condition with treatment focusing on symptom management and hygiene.

Natural products in cosmetics are beneficial for skin and hair care with low toxicity.

Stress-related substance P may lead to hair loss and negatively affect hair growth.

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

Effective hair loss treatment in women requires correct diagnosis and can include medications like minoxidil, antiandrogens, and treatments for underlying conditions like PCOS.

Dermatoscopy is a useful tool for diagnosing hair disorders and can help choose samples for more detailed analysis.

Nanotechnology in dermatology shows promise for better drug delivery and treatment effectiveness but requires more safety research.

Estrogens generally inhibit hair growth and improve skin quality, but their exact effects on hair follicles are complex and not fully understood.

Polyamines are important for hair growth, but more research is needed to understand their functions and treatment potential.

Alopecia areata is an autoimmune hair loss condition treated with corticosteroids, and histologic confirmation is the best diagnosis method.