Suggest Treatment For Swelling And Itching In Vaginal Opening

Okay so basically i've had this for about a week or something..
Around the entry to my vagina it seems to be a little bit swollen and extremely itchy. I have no idea what this could be and i'm way too embarrassed to go to my doctor. A couple of days after i had sex i began to get this..but theres no way it's anything to do with condoms because i've been using them for 2 years now without any problem.
I've looked at it, and it doesn't look like theres any abnormalities but it's just red,swollen and itchy.

Thanks for the help