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Acne is a chronic disease linked to various systemic conditions and has significant psychological and social effects.

The document concludes that understanding health requires considering evolutionary perspectives on reproductive fitness, and recognizing the complexity of factors like diet, testosterone, and sexual orientation.

Hormones and genetics affect hair growth and patterns, with some changes reversible and others not.

Hirsutism is common body hair growth due to genetics and hormones, and while not a disease, it can be distressing; virilisation includes hirsutism with other male traits and needs medical attention.

Hidradenitis Suppurativa has genetic links, with certain gene mutations more common in patients and a third of cases having a family history.

Cancer treatments targeting specific cells and the immune system can cause skin, mouth, hair, and nail problems, affecting patients' quality of life and treatment adherence.

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

The 25Up study collected extensive data on mental disorders and related factors in Australian twins and siblings to investigate the genetics of psychiatric illnesses.

Hair diameter and curvature are mostly determined by genetics.

Sphynx cats are hairless and Devon Rex cats have curly hair due to specific genetic mutations.

Plant root hair growth is controlled by the hormone auxin, which affects the production of certain oxygen-related molecules through a specific process.

Children's hair loss can be caused by many factors, including autoimmune diseases, emotional stress, genetics, and infections, with treatment and prognosis varying.

Researchers made stem cells from human hair follicle cells with better efficiency than from skin cells.

Acne is linked to complex skin microbe interactions, and new findings suggest microbiome-based treatments could be effective.

Intestinal intraepithelial lymphocytes are crucial for gut immunity and maintaining the mucosal barrier.

Fibroblast Growth Factors (FGFs) are important for tissue repair and regeneration, influencing cell behavior and other factors involved in healing, and are crucial in processes like wound healing, bone repair, and hair growth.

Mast cells likely promote skin scarring and fibrosis, but their exact role is still unclear.

The skin systems of jawed vertebrates evolved diverse appendages like hair and scales from a common structure over 420 million years ago.

Prdm1 is necessary for early whisker development in mice but not for other hair, and its absence changes nerve and brain patterns related to whiskers.

A specific enzyme is crucial for the bean plant's relationship with certain beneficial soil bacteria and fungi.

Hair loss in men is common, treatable, but not curable.

Loss of a specific protein in skin cells causes symptoms similar to psoriasis.

Melasma's causes include genetics, sun exposure, hormones, and oxidative stress, and understanding these can help create better treatments.

Skin needs dermal β-catenin activity for hair growth and skin cell multiplication.

Different types of hair loss in lupus need careful diagnosis for proper treatment.

The conclusion is that teeth, hair, and claws have similar stem cell niches, which are important for growth and repair, and more research is needed on their regulation and potential markers.

Sonic hedgehog signaling is crucial for hair growth and maintaining hair follicle identity.

Different types of fibroblasts play various roles in both healthy and diseased tissues, and understanding them better could improve treatments for fibrotic diseases.

The skin's basement membrane is specially designed to support different types of connections between skin layers and hair follicles.

Hairless mammals evolved quickly in both gene and non-gene areas related to skin and hair.