Hello, and i hope I can help you today.
First of all, if you are in pain when you have sex, and if your skin has some changes that you cannot identify, you should stop having sex and not continue until you see a GYN doctor for evaluation.
There are quite a few possibilities of why your vagina may hurt. You may have a
vaginal infection, like a yeast or bacterial infection, which can cause discomfort and usually a discharge or odor, or even an
STD like
herpes, which causes painful bumps and sores, or genital
warts, which can also cause bumps that can feel rough to the touch.
Either way, it is not normal to have pain, especially if you did not have any problems before having sex. But a doctor, like an
OBGYN, who is a specialist for women's problems, will need to examine you to make a proper diagnosis.
I hope i was able to answer your question today, and that my advice was helpful.
Best wishes,
Dr. Brown