I have an itchy bump on my vagina. Does anyone know what it might be?
It's difficult to determine something like this online, which is why going to see a doctor is going to be your best bet. Vaginal warts--which is an STD caused by the HPV virus--can be itchy. It's really normal to find a bump on your vagina, but definitely see your gynecologist to determine the best treatment. And if you need more information in general, check out this sharepost on vaginal bumps.
There is no way to know without an examination by a doctor.
But this is common question and it is not always serious. To get some help and insight, you can read this article by Merely Me, a writer and community leader for this site, called, Bumps on the vagina: How to know if it is serious.
Try reading that and if you are still concerned, please see your doctor, to be sure.