Ooooo Poor Buster. Well..I had a Dobie that was the Queen of lumps. I'm glad she aspirated it and sending it out. It could be many things..and very possibly related to his infection. Could be an infected ingrown hair or a cyst. I have to think if she thought it was dangerous in March, she would've had it tested. I was always told, if it moves and isn't attached, it's a good sign. He could have an underlying skin condition that has been dormant for awhile and everything became inflamed at once. How long for the results? Probably tomorrow? Give him big woof from Jake..and a from me..