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I've just come back from the vet - it's nothing serious.
The vet thinks that the infection is a result of a bite - from Dulcie. Possibly she went to pick up the kitten and didn't get the right spot. That sounds plausible as she accidentally bit me when eating some chicken from my hand. That became infected and was all swollen and full of pus.
The vet took him into the adjoining room and cleaned out the infected area. I was practically in tears as I could hear the little thing crying. He had an injection in his tummy and I have to take him back for the next 3 or 4 days for more injections until it's cleared.
So we were all stressed out - but hopefully he's on the road to recovery! Unlike my wallet!