It could an allergy to the condoms or any lube you might be using. It could also indicate an STD.
See your doctor.
Yea, allergy is possible. But also, i suggest you see your doctor to rule out a yeast infection.
Women with yeast infection may develop symptoms including:
Pain/itch/burning at vulva area
Pain/itch/burning in vagina
Pain during intercourse and/or urination
Cottage cheese like vaginal discharge
Swelling and pain around the vulva
Yeast infection is not something serious in most cases, but lots of women are bothered by recurrent infection and can't find their way out. If you do have one, you'll get prescriptions. There's a herbal medicine named SPAM also works well, you can google it and have a look. Hope this helps!
Candy is correct. A yeast infection is most common.
You can also pick up Vagisil or something similar.