Infestation with larvae of the genus Hypoderma, the warble fly.
https://www.blv.admin.ch/blv/fr/home/tiere/tierseuchen/uebersicht-seuchen/alle-tierseuchen/dasselkrankheit.html 2016 false France French hypodermyiasis cattle scientific and technical information
--- http://www.orpha.net/consor/cgi-bin/OC_Exp.php?Lng=FR&Expert=430 2006 France French hypodermyiasis hypodermyiasis rare diseases scientific and technical information