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Testosterone is important for men's sexual function, may help some women's sexual desire, while other hormones and neurotransmitters also play complex roles in sexual behavior.

The nanofibers with two growth factors improved wound healing by supporting structure, preventing infection, and aiding tissue growth.

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

The skin has a complex immune system that is essential for protection and healing, requiring more research for better wound treatment.

The document concludes that the understanding of scar formation is incomplete and current prevention and treatment for hypertrophic scars and keloids are not fully effective.

Videodermoscopy improves diagnosis of hair and scalp disorders and may reduce scalp biopsies.

The secretome from mesenchymal stem cells is a promising treatment that may repair tissue and avoid side effects of stem cell transplantation.

TGF-β is crucial for tissue repair and can cause diseases if not properly regulated.

Eph receptors and ephrins may be promising targets for treating diseases, but more understanding is needed for effective and safe therapies.

The skin is a complex barrier for drug penetration, but understanding its structure and interactions can improve drug delivery methods.

Hair follicles help absorb and store topical compounds, aiding targeted drug delivery.

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

Visible light can damage skin and most sunscreens don't block it well; more research is needed on its effects and protection methods.

Researchers created human hair follicles using a new method that could help treat hair loss.

Stem cell niches support, regulate, and coordinate stem cell functions.

Dermatoscopy and videodermatoscopy are useful for diagnosing and monitoring various skin, hair, and nail conditions.

The document concludes that recognizing and treating cutaneous lupus erythematosus early is crucial for managing the skin and potential systemic symptoms.

Bioprinting could improve wound healing but needs more development to match real skin.

Pregnancy can cause skin darkening, varicose veins, more sweating, hair growth, hair loss after birth, nail changes, and gum inflammation.

Exosomes could potentially enhance tissue repair and regeneration with lower rejection risk and easier production than live cell therapies.

Obesity is linked to various skin problems and may increase the risk of skin cancer.

Low doses of some substances can be beneficial, while high doses can be harmful or toxic.

Cepharanthine is a well-tolerated drug with multiple medical uses, including anti-inflammatory and anti-cancer properties.

Asia has made significant progress in tissue engineering and regenerative medicine, but wider clinical use requires more development.

Some drugs can cause skin, nail, and hair problems, which are important for healthcare professionals to recognize and report.

The document concludes that hair is complex, with a detailed growth cycle, structure, and clinical importance, affecting various scientific and medical fields.

Correct skin biopsy techniques are crucial to avoid misdiagnosis of skin diseases.

Androgens can both stimulate and cause hair loss, and understanding their effects is key to treating hair disorders.

The human hair follicle can store topical compounds and be targeted for drug delivery with minimal side effects.

Hair elemental analysis could be useful for health and exposure assessment but requires more standardization and research.