I HAVE A RECURRING RED SPOT ABOUT THE SIZE OF

I HAVE A RECURRING RED SPOT ABOUT THE SIZE OF A QUARTER ON THE LEFT SIDE OF MY LEFT FOOT NEAR THE HEEL. IT CAN BE VERY PAINFUL. IT GOES AWAY BUT REAPPEARS AT TIMES. CAN YOU TELL ME WHAT IS GOING ON WITH THIS? I'VE BEEN TO A PODIATRIST AND HE DON'T KNOW. MY RIGHT SIDE WAS AFFECTED BY A STROKE 11 YEARS AGO AND NOW THE LEFT SIDE IS MY DOMINATE SIDE.