Alopecia areata is reversible because hair follicles can regenerate due to stem cells.
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June 2023 in “Medicines” Some antiseizure medications can cause reversible hair loss, with valproate, lamotrigine, and carbamazepine being the most common.
August 2021 in “EMC - AKOS - Trattato di Medicina” Acquired alopecia is hair loss that can be reversible or irreversible, depending on whether the hair follicle is destroyed.
A high-fat diet caused severe health problems in female macaques but was reversible with a normal diet, while male macaques reacted differently.
November 2021 in “CRC Press eBooks” Anagen effluvium is a reversible condition causing sudden hair loss, often due to chemotherapy or head radiation.