Welcome to HCM forum. It's very simple that penicillin has worked before to control your oral infection, doesn't mean that it will work for every time. Penicillin is a narrow spectrum antibiotic i.e. it works on limited number of bacteria. This time you may have been affected by some kind of bacteria that is not controlled by penicillin. Facial swelling due to infection is generally 'not sore in touch', as the pus or fluid produced from infection( inflammation) is spread into the tissue spaces of the face and does not create much pressure on nerve endings. But the continued facial swelling may lead to grave consequences. You should IMMEDIATELY visit to dentist. Let him/her examine your problem properly and prescribe a proper antibiotic to control your infection. Do not try to treat infective facial swelling by yourself. You may invite a serious trouble by doing this.
Wishing you a good health.

Hi,

Thanks for asking the query,

Tooth pain along with swelling indicates infection in the tooth that had spread to the periapical tissues.
As you have mentioned that you are taking penicillin, i would like to tell you that antibiotics & analgesics will give temporary relief.
Treatment of the infected tooth is required.
Drainage of abscess is required.
I would encourage you to visit to the Dentist and get the treatment started.
At home take antiseptic mouthwash and lukewarm saline rinses.

Hope this helps out,

Regards...