Had a rather frantic message from my sister today about her little dog. Last week she had a lump aspirated on her little dog's head that she said had suddenly got bigger. The vet at the time said she was relieved after the aspiration as it released a clear liquid so assumed it was a cyst. The 'official' results came back today and she said there was a lot of bacteria in it and 'inconclusive' results. Ted's white blood cells are being 'eaten' ( my sister's words ). He's been put on a course of AB's for a week to see if that helps. I'm familiar with cysts on Cash from time to time but his have never caused him any issues. I've told my sister to calm down as much as possible and to just wait & see now how the AB's go. But can cysts cause this much aggro? I mean, I understand they can become infected so could that be a possibility here do you think?