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Is the blister painful? Have you ever had blisters in the vaginal area before? What size is it? And just to confirm, it is filled with blood, not a clear fluid?
Most likely it is a simple blood blister if you have no history of STD's such as herpes.
Typically, herpes causes ulcers or clear fluid filled blisters in the vaginal area and they are usually painful.
If you develop more, definitely get it checked out by your doctor. I can't say for sure what it is without seeing it, but it is not a typical presentation of an STD. You may have developed a blister from friction.
OK, thanks for your input. Should there be cause for concern when having intercourse since I busted it? How long would be a reasonable amount of time for it to heal?
If you are monogamous, then I would not be concerned about STD. Otherwise, I would use protection until it heals.
It may become irritated during intercourse. I would expect it to heal within about 5-7 days.