Hello, While on a cruise, I did alot of walking and developed a blister on the bottom of my foot just below the big toe. I m diabetic, so am worried that I might not be treating this correctly. I ve kept it clean, washing, etc., and since I got home, I ve soaked my foot in Epsom Salt water. Should I be doing more? What danger signs should I watch for? when to see a Dr.? thank you for your help.