12 citations
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March 1981 in “International Journal of Dermatology” External factors like certain shampoos, bacterial infections, and parasites might cause hair defects similar to genetic conditions.
1 citations
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December 2020 in “International journal of molecular sciences” External factors can cause skin cancer cells that usually don't spread to grow and form tumors in mice.
42 citations
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February 2016 in “Science” The document concludes that both internal stem cell factors and external influences like the environment and hormones affect hair loss and aging, with potential treatments focusing on these areas.
42 citations
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January 2014 in “Cold Spring Harbor Perspectives in Medicine” Hair growth is influenced by various body and external factors, and neighboring hairs communicate to synchronize regeneration.
22 citations
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November 2018 in “Medical Clinics of North America” Facial aging is caused by natural processes and external factors, and can be managed with preventative measures and a variety of treatments tailored to individual needs.