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This study proposes the sebogenic hypothesis, suggesting that hair follicles evolved from primitive sebaceous glands to facilitate lipid transport and improve water retention in early land-dwelling animals.

This study observed that developing mammary organs in Monodelphis domestica show mammary hairs in 12-week-old females, which disappear by 18 weeks, with findings suggesting shared characteristics between their nipples and eutherian nipples, supporting the evolutionary link between mammary glands and hair organs.

This review explores theories on the evolution of hair from synapsid scales and glands, proposing mechanisms supported by comparative studies, but reports no new experimental findings.

Transplant patients often get skin problems, with treatments varying by condition.

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