HELP! Dog has a skin fungus.

[iMsoLucky0]

I was in Vegas last week and get home to my wife and 2 English Bulldogs to find out that the older of the two bulldogs has some kind of skin problem. He just has huge bumps all over his body. The bumps range in size from quarter sized to 2 inches in diameter. They probably come out of his skin like a quarter of an inch.

I have an appointment to take him in to the Vet tomorrow, but it's really kinda freaking me out. Also, the bumps get worse or better depending on the day. Like yesterday, he had maybe 2 bumps all over. Today he has like 15.

Does anyone know what this is or how serious it is? I'm worried about my little buddy.