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The document explains how shampoos clean, rinses condition, one-step shampoos offer convenience, and hair growth promoters aim to prevent hair loss, emphasizing the importance of scientific evidence for their effectiveness.

Skin stem cells are crucial for maintaining and repairing the skin and hair, using a complex mix of signals to do so.

Hair follicles are complex, dynamic mini-organs that help us understand cell growth, death, migration, and differentiation, as well as tissue regeneration and tumor biology.

Medium-sized particles penetrate hair follicles better than smaller or larger ones, which could improve delivery of skin treatments.

Acne affects most teenagers and can continue into adulthood, with various treatments available that show improvement but have concerns like antibiotic resistance and side effects.

Zinc is effective for treating various skin conditions, including warts and acne.

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

Cathepsin L is essential for normal hair growth and development.

Hair follicles may soon be used more for targeted and systemic drug delivery.

Hormones, especially androgens, play a big role in acne, but most acne sufferers don't have a hormone disorder. Hormonal treatments, including birth control pills, can be very effective for women whose acne doesn't improve with regular treatments.

Hormonal treatments, including birth control and antiandrogens, can effectively treat acne in women.

All-trans retinoic acid causes hair loss by increasing TGF-β2 in hair follicle cells.

Skin changes can help diagnose and manage endocrine disorders like thyroid problems, diabetes, and adrenal gland conditions.

Skin development in mammals is controlled by key proteins and signals from underlying cells, involving stem cells for maintenance and repair.

Hormonal treatments can help with acne but are not the first choice due to side effects and the need for careful patient selection.

The circadian clock influences the behavior and regeneration of stem cells in the body.

Short-chain fatty acids from *Cutibacterium acnes* cause skin inflammation, contributing to acne.

PCOS affects women's health by increasing the risk of diabetes, heart disease, and reproductive issues.

Anti-acne medications may work by reducing the activity of a protein involved in acne development.

Blocking BMP signaling causes hair loss and disrupts hair growth cycles.

The balance between androgen receptor and p53 is crucial for sebaceous gland differentiation.

Different women's hair and skin glands respond to hormones in varied ways, which can cause unwanted hair growth even with normal hormone levels, and more research is needed to treat this effectively.

Prolactin may play a significant role in skin and hair health and could be a target for treating skin and hair disorders.

RU 58841 may treat acne, hair loss, and excessive hair growth.

Ice-skating athletes often have skin problems due to cold, infections, and inflammation, needing careful treatment and prevention.

The best way to treat acne is to prevent healthy skin glands from turning into acne lesions by controlling the triggers early on.

High testosterone to epitestosterone ratio in hair could predict male-pattern baldness.

The document concludes that more research is needed to understand excessive hair growth in women with normal hormone levels and regular ovulation.

Hormonal treatments are effective for severe or persistent acne and should be used with other acne therapies, considering potential side effects.

Human skin produces sex hormones like estrogen and testosterone, influenced by ARO and StAR, which may affect skin elasticity and hair growth.