After recent excessive walking (about 6- 9 miles) I develop red blotches like blood pooling just under the skin even some on top of the years ago varicose veins from childbirth. I wear stretchy knee supports (arthritis) and capri length slacks. Two days later areas have clear/normal color centers almost in circular size as if the red is disappearing/healing from the center to the edges. Have I just done to much power walking in the midwest summer 90-95 degree heat? I stay hydrated and dash into AC stores when possible. This has occurred twice in the last two weeks when I have done this fast paced stride (18min mile) while city sightseeing . I also use walking poles to eliminate knee and back strain. The initial time it happened the redness disappeared within 3 days