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Accidental injection of hyaluronic acid caused temporary hair loss and skin damage, but treatment restored hair and healed the skin.

Hair follicles create different cell layers and proteins, controlled by various molecules.

Alopecia areata in these mice is inherited, more common in young females, and can be treated with triamcinolone acetonide.

Male hormones promote hair cell growth by using a growth factor from nearby skin cells.

Hair stops producing melanin as it transitions from the growth phase to the resting phase.

Male accessory sex glands in rats rarely develop tumors and respond to hormones.

The hair dye formulations tested did not cause long-term toxicity or cancer in mice.

Coal tar shampoo increases enzyme activity in hair follicles, enhancing carcinogen binding to DNA.

Prostate cells have proteins that bind to specific hormones, which can increase protein production when activated by these hormones.

Different zinc compounds cause varying levels of skin irritation in animals.

Human beard hair follicles change testosterone into other related hormones, but don't much change androstenedione into testosterone.

Testosterone is made by Leydig cells, is active when not bound to proteins, and works by binding to receptors in muscles and other tissues.

Small amounts of Vitamin D3 can boost hair growth, but too much can stop it.

The punch graft technique effectively redistributes hair to cover bald areas.

The argon gas-based cryotherapy effectively reduced keloid scars but caused some hypopigmentation and had a recurrence rate, especially in Afro-American patients.

Er:YAG laser therapy is not effective for widespread facial eruptive vellus hair cysts due to recurrence and side effects.

Epithelial proliferation and hyperkeratosis are linked to gastric ulcers in pigs.

The mouse model could be useful for baldness research and testing treatments like testosterone, cyproterone acetate, and minoxidil.

Newborn screening for biotinidase deficiency is effective in preventing severe complications.

Topical antiandrogens might be a good option for male-pattern baldness with fewer side effects, but more research is needed to confirm their safety and effectiveness.