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Hair follicle size and distribution vary significantly across different body sites.

Human skin cells can create new hair follicles when transplanted into mice.

Inflammatory skin conditions are the most common in Brazilian children, with atopic dermatitis being the top issue.

Platelet-rich plasma shows promise for skin and hair treatments but needs more research and standardization.

Biotin supplements may improve hair and nail growth in people with certain deficiencies or conditions, but there's not enough evidence to recommend it for healthy individuals.

The most common hair loss type at specialist clinics is androgenetic alopecia, especially in younger men, followed by alopecia areata and telogen effluvium, with differences seen across regions.

PRP treatment helps hair growth in most cases, but more research needed.

Botulinum toxin shows promise for various skin conditions but requires more research for confirmation and standardized use.

Stress may trigger hair loss by affecting immune protection in hair follicles.

Some alternative treatments for hair loss might work, but more research is needed.

The document concludes that sexual and psychiatric side effects from 5-alpha-reductase inhibitors are reported, but more high-quality research is needed to understand how often they occur.

IGF-1 may affect hair growth and loss, but more research is needed to confirm effective and safe treatments.

Hair loss due to syphilis can be identified using trichoscopy and is treatable with antibiotics.

COVID-19 may cause early hair loss similar to classic temporary hair loss, with further research needed.

Some medications might reverse gray hair, especially those that reduce inflammation or stimulate pigment production, and vitamin B might help.

The document concludes that accurate diagnosis and treatment of scalp itch require differentiating between various conditions using a proposed five-step evaluation process.

Children with trichotillomania often pull hair from their scalp, and parents may not notice; stress can trigger it, and asking detailed questions helps in diagnosis and treatment.

Hair transplantation may work for some types of scarring alopecia, but results vary and more research is needed.

Thallium, mercury, selenium, and colchicine strongly cause hair loss.

Ruxolitinib helped a man regrow his beard after years of hair loss.

The conclusion is that primary scarring alopecia is a complex condition that requires early and accurate diagnosis for effective treatment.

Alfredo Rebora suggested a new, easier way to classify hair loss in Telogen Effluvium, adding a type possibly related to autoimmune diseases.

The report found a new type of hair loss in African-American women that affects more areas of the scalp than previously thought.

Trichoscopy helps diagnose hair and scalp disorders in dark-skinned people by identifying unique patterns.

The paper suggests improving diagnosis and treatment of telogen effluvium but does not recommend a new classification system.

Certain diets may help with hair growth in people with different types of hair loss.

Intralesional corticosteroids work best for mild alopecia areata, and DPCP works best for moderate to severe cases.

Nickel, cobalt, balsam of Peru, fragrance mix, carba mix, and propylene glycol are common allergens causing scalp contact dermatitis.

Increased scalp sweating in frontal fibrosing alopecia may be linked to local skin inflammation.

A shampoo with cannabidiol can significantly reduce scalp inflammation and symptoms in people with mild to moderate psoriasis or seborrheic dermatitis.