My dog is a female pit bull and has the same thing as yours...I've been doing some research about it and I'm very concerned about it so iv'e decided to take her to the vet. I would say take your dog to the vet and see what they say....
My Dog Has A Small Hard Lump Just Under The Skin Beside One Of Her Nipples?
My dog has a small lump about the size of 2 grapes put together in her nipple area what could it be
My black lab had a small hard lump, but on her chest. It was a tumor that the vet recommended should be removed as soon as possible. It wasn't life threatening, but grew to the size of a baseball before I had the vet remove it. Have a vet look at it.
My dog also has a lump on the side of her nipple and she is a winner dog I just don't now if it can be milk or a tumor.