Sometimes, lumps appear on the front part of my scalp ( pea sized), they are there for a few days, and then the inflammation reduces and they disappear. Most of the times this has happened, some lymph nodes behind my ears are inflamed too. I thought that maybe the lumps in my head were also swollen lymph nodes, but I've looked up online, and I believe there are no lymph nodes in that region of the scalp. My question is: what could they be? Could they be lymph nodes? Should I be worried? Thanks!