One of mine got a bulge about two months ago under her left armpit. I took her to my vet, and he aspirated them/looked at them under a microscope. All he could find in the fluid was protein that looked completely normal. He removed all of the fluid in that area with the syringe, and the armpit went "flat" again for about a week... and then it was back! She STILL has a single love handle, but is eating and growing great. It hasn't seemed to affect her health adversely at all, so I'm not going to worry about it anymore. 
