We all knolw that's my line - Go to your Vet!!!
I found a small lump on Sasha a week or so ago. I had the vet check it while she was boarding and told him to do a needle aspirate if he thought it was necessary. When Bubba picked the girls up today the vet said that it was more like a pimple and he and squeezed it and it had gone away. Since Wallis has that fibrosarcoma I'm really paranoid about those things.
It could be as innocent as a sebaceous cyst (a cyst in the oil gland in her skin) but if there is any question in your mind please have her seen.
Let us know what you find out.
RIP Wallis, John Robert, Tibby & Pip
Mom to JoJo, Roxie & Linguini (Cavaliers)
and my birds Moji (Senegal) and Walter (Blue Front Amazon)