The very last wisdom tooth sprouting. but this one is giving me more pain than the others. can piroxicam and paracetamol be taken for 3 or 4 days?

Not likely a cure: You can take these for pain as they are pain medications, but if you have an infection around that erupting wisdom tooth the medicines may not cure. Best to see a dentist or oral surgeon to evaluate the erupting tooth. After a diagnosis proper treatment can be rendered.

Yes, but: Yes, but longer than that you should seek help to speed the process. Rinse with salt water, 1/2 teaspoon to a warm glass of water to help clean the area. Itchy rash is a caution for some kind of allergy.