I have unexplained swelling in my 2nd toe, right foot. Initially I thought it was a bite of some sort. I have tried soaking in epsom salt, ice, elevating, 800mg ibuprofen, etc. The center of the pain seems to be near or at the joint where my toe joins my foot. It's painful along the bone in both directions to the end of the toe to about 3-4" up my foot. This morning there is a red 'triangle' on the top of my foot. The pain/swelling is bad enough that I can't walk or put any pressure on my foot.