Its hard to say about the M2 but it didn't hurt. It was more for the red sore and scratches she had. IMHO, I'd use it just in case there's a bacterial component to this, as you said.

I really think it was the epsom salt IMHO b/c I didn't see any drastic reduction in size until we increased it to 1/2 tsp in the 2g and after that it only took a couple days. But we used it as a last resort b/c it can be so stressful. If you do decide on the epsom salt, perhaps start small like I did and see if that helps first. Also, I added it directly to the QT but maybe it would be less stressful to give her a bath and then return her to QT??? Mac and Todley can provide better feedback.

HTH, S-