Day 4 post teeth extractions, area under jaw/chin swollen and sore. no infection prior to extract -not on antibiotics, prescription rinse only normal?

It is normal: and very common after tooth extraction. Tooth extraction is a surgical procedure and is not completely risk-free. Pain, swelling, bad breath and infection following surgery is usually at its worst 24 – 48 hours after surgery. After that it should subside more and more every day and after 7 days stop. Follow your surgeons' instructions. Good luck.

Common: It's common in this short period after surgery to have residual swelling. It's related to the inflammation from the extractions. But if you start developing redness, progressive pain, swelling and/or fevers then you should seek input from your dentist. You may also consider utilizing ice packs to help reduce inflammation too. Best of luck.