Seems like i have a swollen lymph node in my neck right basically under my right ear lobe. what could cause this? it is painful and bothersome. something i should worry about?

Lymph nodes often swell transiently in response to infection. Swelling in the lymph nodes of the neck often occurs with viral upper respiratory infections for example. Consider OTC pain relievers and consider getting evaluated if it does not improve in a few days.

If the discomfort is mild, probably this isbn't serious and can wait a while. However, get care right away if the pain is severe, if the lump is enlarging rapidly or the skin over it is reddened, or if you have fever. If high fever and severe pain, don't wait -- contact your doctor and/or visit urgent care or an emergency room even if it's over the weekend.