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

Avoid chemical and physical damage to protect hair.

Melasma is a skin condition linked to female hormones, genetics, UV exposure, and certain medications, but not to pituitary, adrenal, or thyroid diseases.

The document explains hair and nail biology, common hair loss conditions and treatments, oral and genital skin diseases, and the risks and treatments associated with squamous cell carcinoma.

The document reviews various hair and nail disorders, their causes, and treatments, emphasizing the need for proper diagnosis and the link between nail changes and systemic diseases.

Finasteride treats hair loss but may cause low libido, erectile issues, and depression.

Multiple-wavelength radiation helps hair grow by boosting early hair follicle development.

Tandem repeats significantly influence hair color, especially darker shades, across different ancestries.

Alopecia areata severely impacts quality of life, mental health, and work productivity.

Pica disorder in central Iraq is mainly found in females and is linked to low iron levels; treatment with iron improves most patients.

Higher TGF-β signaling may increase skin cancer risk in organ transplant recipients.

Methotrexate may effectively and safely treat hair loss in children, with notable improvement after 12-15 months.

The document is a detailed guide on skin conditions and treatments for dermatologists.

The document concludes that various topical medications are effective for skin conditions but often cause skin irritation as a side effect.

Topical imiquimod is as effective as 5-fluorouracil for treating actinic keratosis, with about a 5% risk of it turning into squamous cell carcinoma.

Blocking CCR5 can prevent and improve hair loss in alopecia areata.

Scarred skin in lichen planopilaris loses immune cells due to a decrease in a specific protein in skin cells.

Human hair follicles have a unique way of using energy and might use the Cori cycle; blocking CCR5 could help treat hair loss.

Female hair loss is often hereditary and can be treated with medication, hair transplants, and lasers.

Low-level laser therapy combined with Neoptide improved hair regrowth better than either treatment alone in rats.

The document concludes that new treatments for skin conditions are complex but effective, including spironolactone for female hair loss and propranolol for infantile hemangiomas.

Acidic sandy clay damages archaeological hair the most, while dry conditions preserve but make it brittle; silicone oil can help keep the hair flexible.

The document summarizes medical findings on topics like heart rhythm treatment, sleep apnea therapy, and various health conditions and treatments.

Hair loss in children can be caused by fungal infections, trauma, autoimmune disorders, or stress, and treatments vary depending on the cause.

Many men with male pattern baldness have abnormal blood fat levels, which may raise their risk of heart disease.

Improving artificial vascular grafts requires better materials and surface designs to reduce blood clotting and support blood vessel cell growth.

Vitamin D receptor interacts with certain dietary components to help prevent diseases and regulate hair growth.

The Rotterdam Study aims to understand disease causes in the elderly and has found new risk factors and genetic influences on various conditions.

The Rotterdam Study updated its design and objectives in 2012, providing insights into various diseases in the elderly, including skin cancer, bone health, liver disease, neurological and psychiatric conditions, and respiratory issues.

Alopecia areata is an autoimmune disease causing patchy hair loss, often with other autoimmune disorders, but its exact causes are unknown.