Are round swollen lymph nodes concerning? one small round lymph node behind ear with no other symptoms. grown in size from yesterday. google says round lymph node = cancer. is this true? or could this be an early sign of something like a cold?

Lymph nodes are little serum strainers that specialize in removing debris from the clear body serum. They enlarge when they are active and shrink back to resting size when quiet, Bug bites, viruses, regional infection, skin rashes are part of what triggers these to grow and shrink over weeks/months. Detection is easier over the head where they are not buried in muscle or fat. Cancer is unlikely.