DO I HAVE STD'S / HIV/ AIDS??? LITTLE SPOTS ON MY KNEE?

IVE GOT 4 SPOTS ON MY RIGHT KNEE ABOUT 4 WEEKS AGO, THEY SEEMED TO HAVE DIED...
I HAD SEX WITH A ESCORT (PROTECTED)
NOW THERES A NEW FRESH LITTLE SPOT O MY LEFT ANKLE.. IS IT SPREADING.. TELL ME WHATS HAPPENING