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

Humans lost body hair relatively recently in evolution.

Estrogen therapy can reduce skin aging but has cancer risks.

The document concludes that more research is needed to better understand and treat primary cicatricial alopecias, and suggests a possible reclassification based on molecular pathways.

Minoxidil boosts hair growth by increasing cell production and survival.

Alopecia areata is an autoimmune disease causing patchy hair loss, often with other autoimmune disorders, but its exact causes are unknown.

Keratinocytes help heal skin wounds by interacting with immune cells and producing substances that kill pathogens.

The WNT signaling pathway is important in many diseases and targeting it could offer new treatments.

RNAi-based biopesticides could be safe and effective for pest control with careful development and risk assessment.

Transplant success has improved with better immunosuppressive drugs and donor matching.

Eating less sugar, milk, and saturated fats and more vegetables and fish may help treat and prevent acne.

Stem cell therapy, particularly using certain types of cells, shows promise for treating hair loss by stimulating hair growth and development, but more extensive trials are needed to confirm these findings.

Stem cells in the hair follicle are regulated by their surrounding environment, which is important for hair growth.

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

The conclusion is that PCOS is caused by ovarian sensitivity to hormones and disrupted hormone control, possibly due to ovarian factors, and more research is needed.

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

Choosing the right patients, using proper techniques, and having thorough knowledge are key to preventing and managing dermal filler complications.

Substances from Chinese medicines show promise for immune support and disease prevention, but the way they are processed affects their effectiveness.

Understanding how cells die in the skin is important for treating skin diseases and preventing hair loss.

Vitamin D has potential benefits for cancer prevention, heart health, diabetes, obesity, muscle function, skin health, and immune function, but clinical results are mixed and more research is needed.

The document concludes that while significant progress has been made in understanding skin biology and stem cells, more research is needed to fully understand their interactions with their environment.

Macrophages help regrow hair by activating stem cells using AKT/β-catenin and TNF.

People with PCOS, especially if obese, often have NAFLD, linked to obesity, insulin resistance, and high androgen levels.

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

Tiny particles from stem cells help activate hair growth cells and encourage hair growth in mice without being toxic.

Lignans and neolignans from plants may help protect against various health issues, including cancer and heart disease.

Blocking the Wnt pathway could lead to new treatments for cancer and tissue repair but requires careful development to avoid side effects.

We need more research to better understand human hair follicle stem cells for improved treatments for hair loss and skin cancer.

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

Restoring hair bulb immune privilege is crucial for managing alopecia areata.