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Melatonin is important for skin health and protection, and can be made by the skin or applied to it.

The document concludes that the 5 alpha-reductase enzymes are important in steroid metabolism and related to various human diseases, with inhibitors used to treat conditions like male pattern baldness and prostate issues.

Tiny pollution particles called PM2.5 can harm skin cells by causing stress, damage to cell parts, and cell death.

MK-0773 safely increased muscle mass but did not improve muscle strength or function in elderly women with sarcopenia.

Laser hair removal is the most requested cosmetic procedure and has become a scientifically-based treatment suitable for all skin types.

Male and female skin differ in many ways, which could lead to gender-specific skin treatments.

Stem cell niches are crucial for regulating stem cell renewal and differentiation, and understanding them can help in developing regenerative therapies.

Lecithin organogels could be good for applying drugs to the skin because they are stable, safe, and can improve drug absorption.

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

The hedgehog signaling pathway is crucial for hair growth but not for the initial creation of hair follicles.

Estrogens can improve skin aging but carry risks; more research is needed on safer treatments.

Menopause can lead to skin and hair problems due to hormonal changes, but hormone replacement therapy might help slow these effects.

Cancer treatments targeting specific cells and the immune system can cause skin, mouth, hair, and nail problems, affecting patients' quality of life and treatment adherence.

Epigenetic changes control how adult stem cells work and can lead to diseases like cancer if they go wrong.

New effective scar treatments are urgently needed due to the current options' limited success.

Isotretinoin is highly effective in treating severe acne, rosacea, and gram-negative folliculitis.

Chemotherapy can cause skin problems like hair loss, mouth sores, and skin darkening, and recognizing these can affect treatment decisions.

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

Hair follicle stem cells are key for hair and skin regeneration, can be reprogrammed, and have potential therapeutic uses, but also carry a risk of cancer.

Telocytes might help with skin repair and regeneration.

New insights show Lichen Planopilaris is a rare, scarring hair loss condition, hard to treat, mainly affecting middle-aged women, and significantly impacts mental health.

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

Estrogens significantly influence hair growth by interacting with receptors in hair follicles and may help regulate the hair growth cycle.

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

Different types of stem cells in hair follicles play unique roles in wound healing and hair growth, with some stem cells not originating from existing hair follicles but from non-hair follicle cells. WNT signaling and the Lhx2 factor are key in creating new hair follicles.

Memory T cells in the skin balance staying put and moving into the blood, clustering around hair follicles, and increasing in number after infection.

New research suggests that skin cell renewal may not require a special type of cell previously thought to be essential.

Male and female skin differ due to hormones, affecting conditions like hair loss, acne, and skin cancer, and suggesting a need for gender-specific treatments.

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

Stem cell self-renewal is complex and needs more research for full understanding.