I am an 80 year old white male, 5 ft 8 in, 175 lbs. Both of my ankles half way up my legs are a dark brown color, skin is shiny. No pain, but just curious what would have caused this condition. Has been this way for quite some time. Seems to be more prominent during warm months when I am doing yard work. I still mow my one-half acre with a powered push mower, ground is mostly level. Any suggestions would be appreciated. Thank you.