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Androgens can both stimulate and cause hair loss, and understanding their effects is key to treating hair disorders.

The skin is the largest organ, protecting the body, regulating temperature, and producing hormones.

Dermatologists play a key role in identifying and documenting signs of abuse and injury for forensic investigations.

Monotreme hair structure and protein distribution are similar to other mammals, but their inner root sheath cornifies differently, suggesting a unique evolution from reptile skin.

Sex hormones, especially estradiol, can change chicken feather shapes and colors.

Hair absorbs molecules differently based on their size, charge, and love for water, and less at higher pH; this can help make better hair products.

PGA-4HGF may help treat hair loss by activating hair growth pathways and extending the hair growth phase.

The skin has multiple layers and cells, serves as a protective barrier, helps regulate temperature, enables sensation, affects appearance, and is involved in vitamin D synthesis.

The genes KRT25 and SP6 affect curly hair in horses, with KRT25 also causing hair loss. If both genes are mutated, the horse gets curly hair and hair loss. KRT25 can hide the effect of SP6.

The developed system could effectively treat hair loss and promote hair growth.

Hair follicle development is controlled by interactions between skin tissues and specific molecular signals.

Overactivating Hedgehog signaling makes hair follicle cells in mice grow hair faster and create more follicles.

Improving the environment and cell interactions is key for creating human hair in the lab.

Lichen planopilaris and frontal fibrosing alopecia are likely the same disease with different clinical appearances.

Accurate diagnosis of cicatricial alopecias requires thorough scalp examination and multiple biopsy techniques.

A new way to find eyelash mites without pulling out eyelashes.

The document concludes that successful surgical repair of scalp and forehead issues requires careful planning and various techniques depending on the injury or defect size.

Surgical hair replacement is a viable option for male pattern baldness when done with proper planning and realistic expectations.

Hair casts are small structures on hair shafts with unknown causes.

Hair casts are harmless but can be mistaken for head lice.

Hair casts, also called pseudonits, are often mistaken for other conditions.

Hair casts can be treated with physical removal and special shampoos.

Hair follicles repair 3D injuries using a 2D healing process.

Peripilar keratin casts are a helpful sign for diagnosing traction alopecia.

A genetic change in the EDAR gene causes the unique hair traits found in East Asians.

Different types of skin pores should be identified correctly and evaluated with suitable methods for reliable results.

The article concludes that using the single-scar technique for hair transplants can result in a more attractive scar and that concerns about the technique can be managed with proper methods.

The single-scar technique in hair transplantation minimizes scarring and preserves hairs for future use, with proper training overcoming its perceived drawbacks.

The commentary suggests that using a single-scar technique for hair transplants can give good cosmetic results, but some surgeons hesitate to use it despite ways to address their concerns.

Lecithin organogels could be good for applying drugs to the skin because they are stable, safe, and can improve drug absorption.