may I give you an advice? I am not expert of abscesses, but my male piggie who was neutered two months ago last week developed a sort of an abscess in his right testicle. It is a different story and my piggie's abscess which looked like a quite big ball was lanced by himself after 3 days, just when I was at the phone with the exotic vet. I went to the vet then, when the abscess was empty and the testicle had this sign:

the vet (a very expert one) proposed me a different treatment: no Bactrim, no Baytril, no antibiotics which can affect methabolism and appetite, but only a cream (Silver Sulfadizine) which is a HUMAN product for bad sores, burns and similar troubles. Sulfadizine is also an antibiotics and can be licked without any effect on the piggie; the silver acts as an antiinflammatory and painkiller. I had to fill the scrotum with this cream once a day using an insuline syringe (no needle) putting the top of the syringe INTO the hole (the vet squeezed the part and some pus came out, but no smell). Moreover here in Italy all the piggies are adviced to get a little supplement of vit C daily (I give him 2 drops of vit C INTO HIS MOUTH; I use the pediatric drops); in these days I was adviced
to double his dose of vit C and I am giving him 4 drops (=24mg).
After 5 days I guess I can stop the cream as the testicle now is almost totally closed and no cream goes inside from the hole; this was the sign the vet was waiting for; he said "when the cream cannot be put inside, you have to stop". Consider that in the first days of the treatment I filled the scrotum with two full syringes!
This is my piggie's zone of abscess, the pic was taken few minutes ago for you:

there is no visible hole, no black, no sign of infection.
If I were you, I would give it a try and the cream is sold in China, too
This is the italian box we can buy at the chemist's
