it could be an infection you should see a doctor.
The vulva and vagina can be red, swollen, and painful.
If the red swollen mark at the back of your hand seems like a raised red welt and there is a spot on the middle and feels so itchy and painful, then probably it is a spider bite.
Scratching can indeed cause swollen lips. This is likely because there is a great irritation that is not normally there.
fainting, blue lips, swollen limbs/face, painful arm... i think that's all the most common ones
Sounds like Strep....whatever it is, you definitely need a doctor, or at the very least an antibiotic! QUICK!
you need to phone 911 ASAP
Painful.
Torn legaments
take a doctor
That's an antibiotic, and you shouldn't be self-medicating with those. Depending on WHY your lips are swollen and blistered, it might not do you any good anyhow.
If its been swollen, discolored (red/purple), or itchy for more than 2-3 weeks. Or if the drainage from the piercing is a dark yellow/greenish color. It could just be irritated if its red and swollen. Go check with your piercer to be sure.
Take it to the vet.