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Testosterone affects hair follicles differently across body sites, with beard hair follicles showing more activity of a specific enzyme and presence of androgen receptors compared to scalp hair.

Keratin proteins are consistent across different hair types from the same person.

Testosterone helps beard and axillary hair cells grow by releasing growth factors from dermal papilla cells.

Testosterone increases hair follicle cell growth when beard or axillary skin cells are present together.

The patient had a severe itchy rash and hair loss in the armpits.

A 46-year-old man showed symptoms of a rare condition usually seen in postmenopausal women, highlighting the need for dentist-dermatologist collaboration.

Combining hair transplantation with PRP is more effective for treating hair loss than hair transplantation alone.

Hirsutism perception varies by culture and individual.

An ovarian tumor caused a woman's male-like symptoms, which improved after surgery.

A new type of hereditary hair loss in a Chinese family is linked to chromosome 2p25.1–2p23.2.

Doctors recommend postoperative radiation for male breast cancer, advise against testosterone for vasomotor symptoms post-adrenalectomy, suggest non-hormonal treatments for atrophic vaginitis after mastectomy, note no specific treatment for anticoagulant-induced hair loss, and call for more research on silicosis from silicon carbide exposure.

A woman had both Graham Little-Piccardi-Lassueur syndrome, causing hair loss, and complete androgen insensitivity syndrome, making her genetically male but physically female. This suggests androgens don't affect the hair loss condition.

Most patients with acquired hypoparathyroidism after neck surgery had hair, nail, and skin issues.

A Chinese man with KID syndrome had a new mutation in the GJB2 gene.

Patients with one autoimmune disease should be checked for other autoimmune disorders.

Certain skin drugs and topical agents, including some natural extracts and fragrances, can cause allergic reactions. Some hair dyes and extensions, as well as minoxidil, a hair growth treatment, can also cause allergies. Botulinum toxin A can effectively reduce sweat but may have temporary side effects.

Hair sensitivity to androgens is partly controlled by specific enzyme expressions in different hair areas.

A 19-year-old female with alopecia universalis experienced total hair loss, and previous treatments were ineffective.

A new gene mutation causes complete androgen insensitivity in a 16-year-old with a female appearance.

A 15-year-old girl with no menstrual period was diagnosed with a genetic condition that makes her body unable to respond to male hormones, leading to female characteristics despite having male genetic makeup.

Careful diagnosis is crucial in premature pubarche cases, as 20% have other conditions.

Most treatments for Frontal Fibrosing Alopecia are ineffective, but early anti-inflammatory therapy may help and the condition may stabilize over time.

A 70-year-old woman with a rare skin condition improved after treatment with topical steroids and acitretin.

A three-year-old girl survived a rare serious infection caused by BCG vaccination, which improved after treatment with a leprosy drug.

The treatment successfully integrated hair follicles into a dermal template, showing new hair growth and blood vessel formation.

Androgens can both increase and decrease hair growth in different parts of the body.

Androgens can both promote and prevent hair growth due to differences in gene expression in hair follicles.

Androgens, like DHT, affect hair growth and treatments like finasteride may help.

A woman lost her hair from stress after a bee attack and her sister's death.

Ultrasound shows 80% of Hidradenitis Suppurativa patients have abnormal hair tracts that may worsen the condition.