What Causes Discolouration Of Bottom Half Of The Leg?

DR. I AM,GRANDMAL EPILEPLIC PATIENT, MEDICATED SINCE 1981. FOR THE PAST ONE YEAR MY (HALF)LEGS FROM THE BOTTOM ARE FOUND TO BLACK IN COLOUR AND IF ANY CUT AND BURNS HAPPENS WHICH IS TAKE CURE TOO LONG. I AM NOT DIAPATIC. I AM CONSUMED EPILEX CHRONO 500mg , TWICELY A DAY WITH EPTOIN 100mg. AND INDIRAL 10mg. WAS IT SIDE EFFECTS OF THESE TABLETS ?ALSO I WAS UNDER ERUCTILE DISFUNCTION. WAS IT LEED TO HEART ATTACK? KINDLY CLEAR MY DOUBTS PLEASE.M.S.MOHAMED ADAM ,17.03.15