3 Days Ago I Was Bit By Several Fire Ant,

3 days ago I was bit by several fire ant, on both ankles. The following day the lymph node on the left side of neck became enlarged. I went to the er. They did cscan with contrast, because of thyroid cancer history. Test came out OK. I was prescribed 875mg amoxicillin every 12 hrs. The Dr said the bites could not of caused this swelling. I am still having swelling in neck, and light pain at times.is this normal? Also, ant bites are red and blistered