On penicillian 4 days lanced tooth abcess but returned immediatly and swelling in eye. pain decreased but numbness and swelling same. back to er?

I and D: Yes, you need to go back for an evaluation and treatment asap. Most ER's have no dental specialist to treat you. You are better off seeing a dentist (probably an Endodontist or Periodontist depending upon the cause of the abscess). However, if you cannot get an appointment right away, go back to the ER. A change in dosage, frequency, or antibiotic + further treatment is probably in order.

See an oral surgeon: If the abscess doesn't drain, it may lead to sepsis, a whole-body infection that can cause serious health problems. We have now entered an era where some bacterial species are resistant to the full range of antibiotics presently available. The symptoms you described is a serious medical condition. See an oral surgeon for evaluation and treatment.