
The vet initially said that the first one was caused by a woman who owned a pet shop dropping him (long story - apparently she used to own dachsies and grabbed him out of my friend's arms to weigh him in her shop scales and managed me to drop him!! Friend was very very angry!) but he's had three or four I think since then.
I'll get my friend to mention diabetes to her vet, but presumably he'd have the other symptoms as well and she's not mentioned anything else.
The vet has described them as abscesses (sorry, spelled it wrong in the title!) . They grow pretty big and then burst.