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Chitin and chitosan are useful in cosmetics for oral care, haircare, and skincare, including UV protection and strength improvement.

The conclusion is that proper signaling is crucial for hair growth and development, and errors can lead to cancer or hair loss.

Pregnancy can cause various skin changes and diseases, with PUPPP being the most common skin condition specific to pregnancy.

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

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

Tight junctions are key for skin protection and controlling what gets absorbed or passes through the skin.

Nanoparticles improve drug delivery through the skin but more research is needed on their long-term effects and skin penetration challenges.

Silver can help prevent and treat infections but its effectiveness varies and should be weighed against costs and side effects.

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.

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

Antibiotics can reduce acne but may lead to resistant bacteria, and understanding the skin's bacteria is important for treatment.

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

Inflammation may be linked to hair loss, and targeting specific enzymes could help treat it.

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

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.

Targeting androgen receptors could be a promising way to treat skin disorders with fewer side effects.

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.

Modern lifestyles, including poor diet, stress, and long-term use of certain medications, hinder the body's ability to heal from inflammation, leading to chronic diseases.

Rhodococcus equi causes severe pneumonia in young foals, and effective vaccines are needed due to foals' weak immune responses.

Adult female acne treatment should be personalized, considering individual preferences and pregnancy, using various topical and oral medications while managing side effects and resistance.

New single-cell analysis techniques are improving our understanding of stem cells and could help in treating diseases.

Hair ages due to genetics and environmental factors, leading to graying and thinning, with treatments available for some conditions.

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

Mutant CDP/Cux protein causes hair defects and reduced male fertility in mice.

New nanocomposites with copper show promise for healing burn wounds and regenerating skin.

The document concludes that dandruff and seborrheic dermatitis are linked to inflammation and skin changes, and treating them with specific shampoos can reduce these issues.

Layer-by-Layer self-assembly is promising for biomedical uses like tissue engineering and cell therapy, but challenges remain in material safety and process optimization.

Minoxidil and finasteride effectively treat hair loss.

Inherited ichthyoses cause widespread skin scaling and thickening due to gene mutations.