In the past i have had some of the same symptoms. Red itchy, swollen, hurty lips. No stinky or colored liquid. It doesnt hurt to pee...but does durin sex.
I did go to the hospital about it after a few days.
The doctor told me that women have pores in and around the cooch area...not sure the exact location of the pores but they can get clogged which creates a zit.
They can be treated like one on your face...dont touch it, if you actualy see a white head, pop it... but otherwise leave it alone... it will go away by itself in a few days...if not then see your doctor.
BTW sometimes it may not look like there is a zit.. it will just be painfull.
Also it may happen again, but it is not a disease. causes can be shaving, condoms, not cleaning properly...