I BREAK OUT ON MY ANKLES AND LOWER LEG EVERY

I BREAK OUT ON MY ANKLES AND LOWER LEG EVERY TIME I RIDE LONG DISTANCES ,I WENT TO THE BEACH LAST YEAR AND BROKE OUT SO BAD ,HAD TO GO TO URGENT CARE.THEY HAD NO IDEA WHAT IT WAS. I JUST WEN T FOR A 3 HOUR TIP THIS PAST WEEK AND IT HAPPENED AGAIN, IT B URNS REALLY BAD I PUT ANYTHING I HAVE ON IT TO KOOL IT DOWN,.ITS FADING NOW AFTER ABOUT A WEEK.IT LOOKS LIKE BLOOD POOLING IN MY LEGS, ANY IDEAS????