Bump on the inside after numbing was done for temporary crown. What is this?

I went to the dentist Friday to get a temporary crown for the mean time. So, they numbed me up for the temporary one but I woke up this morning with a bump on the inside of my mouth, it is close to my lip (on the inside) it is a clear bump, almost looks like fluid? What is this? Unfortunately they are closed until the 3rd of January.