Self had kissed a sex worker accidentally on the lips/mouth area. Note no sexual contact or intercourse happened. I am very worried from last few days about catching a STD from the saliva of the female. Now after 3 weeks I have developed a painless red lesion on the side of my tongue from last 2 days and its painless but not ulcers. Kindly advise if it can be any std like sphyllis. The sore is painless and red. No other symptoms present. I AM UNDER LOT OF STRESS AND ANXIETY FROM LAST 10 DAYS AND THEN suddenly I SEE THIS SORE ON MY tough YESTERDAY.