I had sex with a lady before 2 months. I spotted some old scars on her skin in lower abdominal and lower back of her body. Some of them look like healed bug bites and some of them like rash. She was unknown lady and only one time I had sex and it was last within 20min. I use condom and take care to protect. However 3 days before I had small rash on my left thigh and it is bit itching. I don't have any other symptoms. It looks dry and very tiny dry blister around the small round shape spot. Is this any symptoms of STD