Dear Welcome to HCM We understand your concerns I went through your details. Sexually Transmitted diseases are of many kind including Chlamydia, Gonorrhea, Hepatitis B etc. Each one of them having different symptoms and some of them may be common symptoms. Many men are quick to assume that if they had a sexually transmitted disease (STD), they would know it. While most STDs do cause symptoms, many are easily mistaken for other conditions. In some cases there are no symptoms at all. The symptoms of an initial infection can include: Fever and flu-like symptoms. Genital itching, burning, or discomfort. Swollen lymph nodes. A feeling of pressure in the abdomen. In your case, sore mouth does not indicate any STDs. But Both primary and secondary syphilis can show up on your face, and this usually happens by having oral sex with someone with genital lesions. Primary syphilis of the face will usually appear on the lips as a large, open sore. Sores may also be present on the tongue or inside the mouth. Secondary syphilis can have a range of symptoms. Some raised bumps may appear in-and-around the mouth, a reddish rash may appear all over the body and the infected person may even suffer abnormal hair loss (alopecia). Secondary symptoms are also likely to arise from infection due to genital sex, not just oral, as well. I suggest you to consult a physician for further follow up. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications. Good luck. Take care.