Walked 3 or four miles on Thursday. Had on very comfortable shoes, no blisters. Easy Spirit slip ons. Wear them daily. Feet were somewhat swollen Thursday eve. But not unusual since we were taking five hours to get home after walking slowly all day. (Was at a flea market) The ground was not uneven and actually soft in a few areas. Come Friday morning, I awoke to a somewhat disclolored left foot. Only the left foot. There are times it is swollen. The foot has a slightly tender place on the top of that foot where swelling is. I do not remember falling over anything or hurting it in any way. I honestly do not know what is wrong with this foot. Any ideas. I am 69 , weigh more than I should, stand 5 2 tall.