@jult3,
I am not a doctor, I am a nurse.
Your symptoms seem consistent with a Bartholin cyst.
If that is in fact what you have then...
That does require medical treatment.
Here is some information:
http://www.mayoclinic.com/health/bartholin-cyst/DS00667
Bartholin cysts are very common and simply require prompt treatment.
They are not STDs.
Left untreated you may have some problems.
If you have medical insurance I recommend you visit your doctor, rather than an emergency room.
Let me know if you are unable to find a treatment resource, I could make some recommendations if you are uninsured.
I assume you live in the United States.
Take a deep breath... I think you are going to be fine.
It is very much like a pimple (if this is what you have).
There may just be a blockage in one of the ducts that helps lubricate your labia.
The treatment is needed to release the blockage. Don't try to pop it!