A few weeks ago my cat had a lump on his side like a cyst. It popped and healed. But now between last night and early afternoon today he developed two more large lumps, on opposite sides but right in front of his back legs. He is also vomiting. I read online that it could just be intestinal obstruction. He just turned one year on September 26th of this year. He is a fairly fat cat.

Is he an outdoor cat? Cats get 'cat scratch fever' from being bitten buy another cat in fight. This happened to my cat last year. Infected bumps from being bitten. Vet put her on antibiotics. Just a thought, perhaps it is time for a vet trip.