What Causes Multiple Lumps In Neck Area?

Hello Doctor, I m not sure what to think of what I am currently experincing. I have about five different lumps in my neck area and when I first went to a hospital the told me the one at the time was a swollen lymph node, which made sense, being under an abcessed wisdom tooth. They gave me ten days worth of penecillin(?) which I took all as instructed. A couple of days after I was off the antibiotics, I began noticing more and more of these lumps appearing across the right side (where the tooth is). Five in total, from behind my ear to just above my collarbone. the pain is minimal but sometime hurts to swallow. any advice as to what may be happening to me?