Saw it first this morning. He stays in at night, so it's come up overnight.
If it doesn't start to go down by wednesday i'll go to the vet, but just wondered about it.
He's a black cat, and the lip is black so can't tell what colour it is, it's hard and about 1cm across.
He has been off his wet meat the last couple days but he's very fussy too, but is mad and lively in himself.