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Different types of stem cells and their environments are key to skin repair and maintenance.

Microneedles help improve skin appearance and deliver skin treatments effectively, but safety concerns need more research and regulation.

The skin's internal clock affects healing, cancer risk, aging, immunity, and hair growth, and disruptions can harm skin health.

Normal skin cell renewal doesn't need RAR signaling, but vitamin A-related skin thickening does.

Hair follicles produce and respond to melatonin, affecting hair growth and sensitivity to estrogen.

The telogen phase of hair growth is active and important for preparing hair follicles for regeneration, not just a resting stage.

Estrogens help reduce skin aging, and SERMs might offer similar benefits without the risks of hormone therapy.

Smoking harms the skin, causing early aging and increasing cancer risk, but stopping smoking can improve skin health.

Men, especially older ones with health issues like prostate cancer, may have worse COVID-19 outcomes and could benefit from therapies targeting male hormones.

South Asian women with PCOS are more likely to have metabolic issues and central obesity, and simple measures like waist size and blood pressure can help identify these risks early.

Skin surface lipids are important for skin health and altering them could help prevent aging and treat skin conditions.

Fullerenes show potential in skin care but need more safety research.

5α-reductase is essential for male sexual development and its inhibitors have potential in treating various conditions related to hormone action.

The sebaceous gland has more roles than just producing sebum and contributing to acne, and new research could lead to better skin disease treatments.

Testosterone supplements can increase muscle mass and strength in older men with low levels, but long-term effects and risks need more research.

Platelet-rich plasma might help tissue regeneration in dentistry, but results vary and more research is needed.

Alpha-hydroxy acids, like glycolic acid, safely improve skin issues and work on all skin types.

Older adults have a high rate of skin cancers like basal cell carcinoma and melanoma, mainly due to UV exposure and age.

Mutant mice help researchers understand hair growth and related genetic factors.

Keratin 15 is not a reliable sole marker for identifying epidermal stem cells because it's found in various cell types.

DHEA stimulates skin oil glands and could help postmenopausal women, with potential for acne and excessive hair growth treatments.

Hair shedding is an active process that could be targeted to treat hair loss.

Stress hormone corticosterone blocks a growth factor to slow down hair stem cell activity and hair growth.

Restoring mitochondrial function in mice reversed their skin wrinkling and hair loss.

Mushrooms have beneficial properties for skin and hair care products and have great potential for future cosmetic use.

Frequent hair coloring and styling can damage hair and cause breakage or loss.

Exosomes from dermal papilla cells help hair growth by making hair follicle stem cells multiply and change.

Women with PCOS have higher androgen levels that decrease with age but are still higher than in women without PCOS.

Fat-derived stem cells, platelet-rich plasma, and biomaterials show promise for healing chronic skin wounds and improving soft tissue with few side effects.

Blocking the enzyme 11β-HSD1 might help treat obesity and metabolic issues.