5 citations,
December 2018 in “Annals of plastic surgery” Some burn patients grew extra hair in areas treated with pressure garments or silicone.
5 citations,
March 1981 in “PubMed” A girl grew extra hair in areas where she had insect bites.
3 citations,
January 2016 in “Case reports in dermatological medicine” An 80-year-old man grew extra hair on his forearms after starting Alzheimer's medication rivastigmine.
January 2012 in “Case reports in pediatrics” A 16-year-old boy's arm hair grew more after wearing a splint, but it returned to normal in 8 months.
4 citations,
January 2011 in “Dermatology” A patient grew extra hair on their ears after treatment for testicular cancer, possibly due to hormonal changes or genetics.