Hi, Im 18 and after having sex with my bf, i started to feel pain down near the bottom of my vagina. I didnt think much of it but a week later it really hurt. When i took a picture of it..it looked like a opening that was yellow and red and it hurts very bad. It Pulsates and it hurts when i have to urinate. I dont know what to do. I just told my mom and she says it looks like mrsa. My mom doesnt know im sexually active. Can anyone help please?