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Alopecia areata is likely an autoimmune disease with unclear triggers, involving various immune cells and molecules, and currently has no cure.

Melatonin may benefit skin health and could be a promising treatment in dermatology.

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.

Low-Level Laser Therapy is effective and safe for hair growth with minimal side effects.

Blocking COX, especially COX-2, in the skin can reduce inflammation and pain and may help prevent skin cancer.

Vitamin D and its receptor regulate skin functions like cell growth, immunity, hair cycle, and tumor prevention.

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.

Skin aging is due to impaired stem cell mobilization or fewer responsive stem cells.

Vitamin D is important for skin health and may affect conditions like psoriasis and hair loss, but more research is needed to understand its role fully.

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

Fat-derived stem cells show promise for skin repair and reducing aging signs but need more research for consistent results.

The conclusion is that Treg-targeted therapies have potential, but more knowledge of Treg biology is needed for effective treatments, including for cancer.

Oxidative stress contributes to hair graying and loss as we age.

Men generally have more severe COVID-19 cases and higher death rates than women due to biological differences.

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

TRP channels in the skin are important for sensation and health, and targeting them could help treat skin disorders.

Testosterone's muscle-building effects do not require its conversion to DHT.

New targets for making and using brain-synthesized steroids could lead to better treatments for brain disorders and alcoholism.

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

Male hormones like testosterone may make COVID-19 worse, and testing for sensitivity to these hormones could help predict how severe a patient's symptoms might be. Treatments that reduce these hormones are being explored.

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

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.

Potassium channel openers could help treat cardiovascular diseases and asthma but require better targeting to specific tissues for effective use.

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

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

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

Applying a special compound can promote hair growth without harmful side effects.

Finasteride may cause long-lasting sexual side effects.

Too much Smad7 can cause serious changes in skin tissues, including problems with hair growth, thymus shrinkage, and eye development issues.

Melatonin helps regulate hair growth and protects the hair follicle from stress.