inflammation of the nail (toe/finger), agitated tissue right under the nail (see Molina)
Alonso de Molina:
mautztemiliztli. panarizo de la uña. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 54v. col. 1. Thanks to Joe Campbell for providing the transcription.