I also noticed tonight, after soaking my feet in the "Johnson's Foot Bath" solution, I was sitting at the computer for a while, and when I got up to go downstairs, I noticed my feet had swollen, which has only happened to me a very few times in my life. The skin was pulled tight from the swelling, and "shiny". I think this is called "edema".
I am so tired, I keep falling asleep sitting upright, as I type this. I am going to go to bed at this time.