Maybe it was just a pimple or wart then.

I know when Tommy was about a year old he had a bump on muzzle, just above his nose, it seemed like a wart. Eventually it went away although you can still see where it was if you look really close, just because the hair is so short in that area.

Cody my RB collie got a sebaceous cyst on his shoulder when he was older. I think those are pretty common too. Sebaceous gland (that provides the oils to skin/coat) gets blocked or something I believe and a cyst can form there. They are completely benign but some can get pretty large and some stay really small.

Anyway, I'll quit rambling now. Glad Daisy's okay.