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Androgens can cause hair growth in some areas and hair loss on the scalp.

Understanding hair growth involves complex interactions between molecules and could help treat hair disorders.

Estrogen therapy can reduce skin aging but has cancer risks.

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

Skin aging is due to impaired stem cell mobilization or fewer responsive stem cells.

Estrogen loss during menopause worsens skin health, but hormone replacement therapy may improve it, though more research is needed.

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.

TRP channels in the skin are important for sensation and health, and targeting them could help treat skin disorders.

The telogen phase of hair growth is active and important for preparing hair follicles for regeneration, not just a resting stage.

The document concludes that while significant progress has been made in understanding skin biology and stem cells, more research is needed to fully understand their interactions with their environment.

The hydrogel with a 1:3 ratio of hydroxyethyl cellulose to hyaluronic acid is effective for delivering drugs through the skin to treat acne.

Hormones, especially androgens, play a big role in acne, but most acne sufferers don't have a hormone disorder. Hormonal treatments, including birth control pills, can be very effective for women whose acne doesn't improve with regular treatments.

The article concludes that the wool follicle is a valuable model for studying tissue interactions and has potential for genetic improvements in wool production.

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

Hair color production is closely linked to the active growth phase of hair in mice and may also influence hair growth itself.

UV radiation can help sterilize wounds and promote healing but requires careful use to avoid damaging cells.

Skin surface lipids are important for skin health and altering them could help prevent aging and treat skin conditions.

The sebaceous gland has more roles than just producing sebum and contributing to acne, and new research could lead to better skin disease treatments.

Hormones significantly affect hair and oil gland function in the skin, and more research is needed on skin-related hormone disorders.

The document concludes that adult mammalian skin contains multiple stem cell populations with specific markers, important for understanding skin regeneration and related conditions.

Notch/CSL signaling controls hair follicle differentiation through Wnt5a and FoxN1.

Stress hormone corticosterone blocks a growth factor to slow down hair stem cell activity and hair growth.

Muscles and nerves that cause goosebumps also help control hair growth.

Environmental factors, hormones, nutrition, and stress all significantly affect skin health and aging.

Hormones, especially androgens, play a key role in acne, which can be a symptom of systemic diseases like PCOS and may require targeted treatment.

Male hormones are important for hair and oil gland development and can cause conditions like excessive hair growth and acne.

mTOR signaling helps activate hair stem cells by balancing out the suppression caused by BMP during hair growth.

Acne is caused by genetics, diet, hormones, and bacteria, with treatments not yet curative.

The document concludes that for hair and feather growth, it's better to target the environment around stem cells than the cells themselves.