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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.

Finasteride and minoxidil are effective for hair regrowth, while treatments for alopecia areata have varying success and continuous treatment is necessary.

Androgens have complex effects on hair growth, promoting it in some areas but causing hair loss in others, and our understanding of this is still evolving.

Thyroid hormones help hair grow, reduce hair loss, and increase hair pigment.

Animals that change color with the seasons mainly do so in response to daylight changes, but climate change is causing camouflage problems that may require evolutionary changes.

Microneedling is promising for treating various skin issues but needs more research to confirm its effectiveness and safety.

The document concludes that assessing hair follicle damage due to cyclophosphamide in mice involves analyzing structural changes and suggests a scoring system for standardized evaluation.

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

Chemotherapy often causes temporary hair loss, which is distressing and needs better treatment and support.

Hair follicles are hormone-sensitive and involved in growth and other functions, with potential for new treatments, but more research is needed.