I have been noticing a lump on the back of my head at the sides and they are painless and kinda of hard and on the middle theres a lump that feels like a bone. I recently hit my head on a wooden surface on that area and i was wondering if it was the cause for the swollen lymph nodes and if they are swollen lymph nodes and if they will go way in a couple of days. I hit my head about a week or some days after i got them.I was wondering if they are related to me hitting my head.