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AGA causes hair loss by shrinking hair follicles due to DHT binding, and can be treated with finasteride and minoxidil.

Melatonin is important for skin health and protection, and can be made by the skin or applied to it.

Guidelines suggest various treatments for alopecia areata, but leaving it untreated is also an option as 80% cases may recover on their own.

The document provides a method to classify human hair growth stages using a model with human scalp on mice, aiming to standardize hair research.

Male and female skin differ in many ways, which could lead to gender-specific skin treatments.

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

Targeted cancer therapies often cause serious skin problems that need careful management.

Estrogens can improve skin aging but carry risks; more research is needed on safer treatments.

Alopecia areata is an autoimmune condition causing hair loss due to the immune system attacking hair follicles, often influenced by genetics and stress.

The 2003 guidelines suggest that while some treatments can regrow hair in alopecia areata, none alter the disease's progression, and wigs may be the best option for extensive hair loss.

Cancer treatments targeting specific cells and the immune system can cause skin, mouth, hair, and nail problems, affecting patients' quality of life and treatment adherence.

Capsaicin, found in chili peppers, can slow down hair growth by affecting skin cells and hair follicles.

Chemotherapy can cause skin problems like hair loss, mouth sores, and skin darkening, and recognizing these can affect treatment decisions.

The conclusion is that accurate diagnosis of different types of hair loss requires good teamwork between skin doctors and lab experts.

Hair follicle stem cells are key for hair and skin regeneration, can be reprogrammed, and have potential therapeutic uses, but also carry a risk of cancer.

Stress-related substance P may lead to hair loss and negatively affect hair growth.

Estrogens significantly influence hair growth by interacting with receptors in hair follicles and may help regulate the hair growth cycle.

Laser device increases hair density, safe for treating hair loss in men and women.

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.

In Italian patients with lupus, the most common skin issue was chronic cutaneous lupus, especially discoid lesions, and nonspecific skin problems occurred in about a third of those with systemic lupus, mainly during active disease.

Modulating BMP activity changes the number, size, shape, and type of ectodermal organs.

Human hair follicle organ culture is a useful model for hair research with potential for studying hair biology and testing treatments.

Obesity is linked to various skin problems and may increase the risk of skin cancer.

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

Postinflammatory hyperpigmentation causes dark skin patches and needs personalized treatment.

Ruby laser pulses best destroy hair follicles during the growth phase and effectiveness varies with laser intensity; melanin is key for targeting, and timing treatments can improve results.

Melatonin helps regulate hair growth and protects the hair follicle from stress.

Microneedling is promising for treating various skin issues but needs more research to confirm its effectiveness and safety.

The document concludes that hair is complex, with a detailed growth cycle, structure, and clinical importance, affecting various scientific and medical fields.

We need more research to better understand human hair follicle stem cells for improved treatments for hair loss and skin cancer.