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Different human traits like skin color and hair type vary between populations due to genetic adaptations to the environment.

OCT is a reliable, noninvasive way to measure hair thickness.

The document concludes that understanding hair biology and recognizing hair conditions are crucial for managing and treating hair loss in children.

Cosmetics enhance beauty, fix defects, and intimidate enemies, with varying cultural standards and alternative methods.

Hair restoration surgery has advanced, focusing on natural results and may improve further with new techniques and therapies.

Darker skin in 10-year-old girls may be an early sign of puberty.

A 38-year-old African American woman has a rare condition that prevents her from growing long hair.

Vitiligo causes white skin patches, often starts before age 20, and is linked to other health issues.

Patients with PCOS tend to score their hirsutism higher than clinicians, making self-scoring less useful for diagnosis.

Redheaded people may have evolved to efficiently make vitamin D in areas with less sunlight.

Treating psoriasis on the scalp, nails, and skin folds is challenging, often requiring systemic treatments for severe cases, with some success in topical and biologic treatments.

DNA profiling in forensics has improved, but predicting physical traits and ancestry from DNA has limitations and requires ethical consideration.

Forensic medicine is crucial for justice and needs continuous innovation and technology integration.

Uncombable hair syndrome causes frizzy hair and can affect the nervous system, eyes, and ears, often co-occurring with other hair, skin, nail, and teeth conditions, and is linked to three specific gene mutations.

Hair absorbs different substances from solutions based on pH levels.

Black women's unique hair characteristics and styling practices can lead to specific scalp conditions, which require early diagnosis and appropriate treatment.

Dissecting microscopes give more and better quality hair grafts than magnifying loupes.

Hair amino acid levels can indicate metabolic disorders.

Keratin films from human hair can potentially replace human nail plates for drug testing.

Human hair contains more glycosaminoglycans in children than adults, and these compounds decrease with age, possibly affecting hair thickness.

Human hair provides more UV protection when aligned and at higher angles, but the scalp still gets UV exposure.

Hair transplanting is a useful, often overlooked treatment for female pattern hair loss.

Hair restoration surgery has improved with better techniques for natural looks and managing patient expectations, but it remains labor-intensive and requires careful consideration of potential complications.

Hair dyes vary in how long they last and how deeply they penetrate hair.

Hair loss that spreads out can often fix itself or be treated by finding and handling the cause.

Babies born after 38 weeks to mothers under 36 years old and not delivered by C-section have a higher risk of neonatal occipital alopecia.

Hair color is influenced by genetics and can indicate certain health conditions.

Laser hair removal before genital surgery can prevent complications and improve patient satisfaction.

Argan oil and cupuassu butter can protect hair after dyeing.

Some drugs can cause hair loss, excessive growth, or color changes, often reversible but sometimes permanent.