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Humans can accurately guess age from faces, with women being slightly better at it, and age perception is linked to evolutionary factors.

The book is a useful guide for dermatologists studying for their board exam, with clinical images and features of skin diseases.

Environmental factors and exposure to toxins may contribute to male infertility by affecting sperm and hormone function.

The document says biodegradable cosmetics and packaging are better for the environment and user experience.

Epigenetic changes contribute to autoimmune skin diseases.

Polycystic Ovary Syndrome (PCOS) often leads to severe acne, and lifestyle changes and hormonal treatments can help manage it.

The document explains how sperm cells are produced, the role of testosterone in this process, and how toxins can reduce sperm count and fertility.

Scalp biopsy helps tell apart permanent and temporary hair loss types and guides treatment.

The chapter explains the causes of excessive hair growth and masculinization in women and how to measure hormone levels related to these conditions.

The document explains the genetic causes and characteristics of inherited hair disorders.

The document concludes that sex hormones are crucial for mammalian reproduction, health, and behavior, and require more research for therapeutic use.

People with alopecia areata often have thyroid autoimmunity.

Chemotherapy often causes hair loss, which usually grows back within 3 to 6 months, but there's no effective treatment to prevent it.

Hair restoration has greatly improved since 1992, moving from obvious grafts to unnoticeable hair transplants, thanks to better knowledge and dedication to excellence.

Most adrenal cortex tumors are benign and non-secreting, but proper diagnosis and treatment are important due to the rare possibility of cancer.

Stress can worsen skin conditions by affecting immune responses and skin cell activities.

New methods for growing skin cells can improve skin grafts by building blood vessels within them.

Non-denatured soybean extracts provide multiple anti-aging skin benefits.

Finasteride is a medicine used to treat enlarged prostate and prostate cancer, and it works by changing how testosterone works in the body.

Using cheek skin and cartilage grafts for nose reconstruction after skin cancer surgery can maintain shape and function but may require multiple surgeries and hair removal in men.

Non-denatured soybean extracts are effective for skin care, offering skin lightening, anti-aging, and UV protection benefits.

Humans have limited regenerative abilities, but new evidence shows the adult brain and heart can regenerate, and future treatments may improve this by mimicking stem cell environments.

The document describes skin diseases affecting the outer ear in dogs and cats, their spread to other body parts, and treatment options.

Lupus affects the skin in various ways, and proper skin examination is crucial for diagnosis and treatment.

The document explains how hair is studied in forensics to identify its source and its role in criminal investigations.

Environmental factors can cause mutations in skin proteins, leading to skin disorders.

Telogen effluvium is a condition that causes temporary hair loss due to stress or shock to the body.

The document concludes that treatments for cicatricial alopecia are not well-supported by evidence, but hair transplantation shows more predictable and satisfactory results.

Hair loss in Androgenetic alopecia (AGA) is due to altered cell sensitivity to hormones, not increased hormone levels. Hair growth periods shorten over time, causing hair to become thinner and shorter. This is linked to miscommunication between cell pathways in hair follicles. There's also a change in gene expression related to blood vessels and cell growth in balding hair follicles. The exact molecular causes of AGA are still unclear.