It could be an allergy to the materials used in your socks or the lining of your shoe. Alternatively, it could be heat rash caused by socks or shoes that don't breathe properly. Try switching to socks made out of 100% cotton.
Hello: I keep getting red blotches just above my ankle bones. They are not there all the time. I also find that my legs overall get very tired all the time, even if I exercise on a regular basis. I also think that my ankles are somewhat swollen.