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

Hair and wool have complex microscopic structures with microfibrils and varying cystine content.

Men are more likely to have severe COVID-19 cases and fatalities than women due to factors like lifestyle, aging, and biological differences.

A patient with Alopecia Areata had complete hair regrowth after using the drug baricitinib.

Essential oils in cosmetics can offer benefits but may cause allergies and should be used carefully.

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

The document concludes that the exact way alcohol causes harm to fetal development is unknown, but it significantly affects nutrient transport to the fetus and a safe level of alcohol during pregnancy is not determined.

Testosterone therapy in transgender men has both desired effects like increased muscle mass and potential health risks such as higher cardiovascular risk.

Women with PCOS face higher risks of diabetes and heart disease, and these risks increase with obesity.

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.

FFA is more common in postmenopausal women, can affect younger women, and may stabilize over time.

Using CDK inhibitors on rats showed a reduction in chemotherapy-caused hair loss, but later experiments could not repeat these results.

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

Antiandrogens are somewhat effective in reducing excessive hair growth in women.

Pig skin is a good substitute for human skin to measure drug absorption, but differences in skin structure and enzymes across species must be considered.

Most people with systemic lupus erythematosus have skin problems, and skin symptoms are often the first sign of the disease.

Some drugs can cause hair loss or increase hair growth, but these effects are usually reversible when the drug is stopped.

Hormone therapy is essential for transgender individuals but requires careful management due to possible metabolic effects.

Lupus affects the body and skin, causing joint pain and skin issues that can be treated with steroids and antimalarial drugs.

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.

Some HIV treatments can harm mitochondria, potentially causing side effects like lactic acidosis and nerve damage.

Estrogen replacement can improve skin health in menopausal women but doesn't reverse sun damage or prevent hair loss.

Estrogen loss during menopause worsens skin health, but hormone replacement therapy may improve it, though more research is needed.

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

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

Early detection and intensive treatment of diseases caused by Staphylococcus aureus toxins are crucial for reducing severe health effects.

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

The conclusion is that FFA and LPP have similar scalp biopsy features, making them hard to distinguish histologically, and FFA may be a specific kind of scarring hair loss.

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