Maybe someone could help me with a very similar issue. My cat has two of these wart like sores. A small one on his back and a larger one on his head. I've squeezed to find white puss like discharge, I've cleaned many times but never seems to close completely or heal.
Help... Not sure what this is but my cat has two, there has been puss which I have squeezed, cleened, dried but it doesn't go away and never closes completely. 1 large one on his head and the other on his back.