I Have A Few Knots In My Legs And Swelling,

I have a few knots in my legs and swelling, not a blood clot, I was treated before with prednizone and naproxine and it went away. It came back now close to two years later and same treatment got rid of but came write back. My dermatoligist has me on potassium iodine drops now(just started). I can't remember the name of the condition I have, can you help?