Different types of sun exposure damage skin cells and immune cells, with chronic exposure leading to more severe and lasting damage.
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April 2007 in “Journal of Medical Primatology” The monkey's hair loss was due to an autoimmune disease, not genetics.
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May 2016 in “Nature communications” Memory T cells in the skin balance staying put and moving into the blood, clustering around hair follicles, and increasing in number after infection.
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January 2017 in “Annals of dermatology/Annals of Dermatology” Certain immune cells contribute to severe hair loss in chronic alopecia areata, with Th17 cells possibly having a bigger impact than cytotoxic T cells.