A new lump

A few months back, Lenny had surgery to remove some teeth and also some lumps from his body. While he was laying with me on the couch on Sunday, I noticed that a new lump has emerged on his left thigh. It has popped up out of nowhere and is already pretty big and hard - maybe quarter of an inch round. It doesn't seem to bother him... but I'm really concerned.

My poor guy. I love him so much. It brings tears to even think about & write this and the preggo emotional rollercoaster is only making it worse. I can't stand to see him go through another surgery. It was hard enough to get him to go back to the vet to have his stitches removed from the last surgery. I have to call the vet to find out what our next move is.