9 citations
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June 1959 in “Archives of dermatology” Hair can darken after inflammation and then return to its original color.
38 citations
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February 2002 in “British journal of dermatology/British journal of dermatology, Supplement” Two patients with porphyria cutanea tarda experienced their grey hair turning dark again.
6 citations
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January 2007 in “Actas dermo-sifiliográficas/Actas dermo-sifiliográficas” Gray hair regained color after thyroid hormone treatment.
47 citations
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January 2013 in “Indian Journal of Dermatology, Venereology and Leprology” Premature graying of hair may suggest health issues and currently lacks effective treatments.
12 citations
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May 2018 in “JAAD Case Reports” A man's gray hair got darker and thicker after using a psoriasis drug.