I was told that I have DM back in 2003 then in 2012 I was told that I don't have DM but I do have PM. Been on pred and mtx since 2003. I feel healthy and for five months last summer I was off the meds. Then in December 2015 both of my ankles swelled and my feet became numb. I have regained some feeling in the right foot. Doctor told me that PM caused it.