Puppy acne?

So we took our 7 month old choc. lab to the vet because she has little red bumps on her belly. He told us that it was no biggie and that they would go away-it is puppy acne. Well, it's been almost a month and it's getting a little worse. The first apt. cost 50 dollars for him to tell me that. She sleeps on a fleece blanket and I just changed it to a few of my old sheets. I hope this helps. Any other ideas of what it may be? Have you heard of this? The bumps are even on her inner-back legs a little. The vet said I could use acne cream BUT she will lick it off.