Can a sinus infection or ear infection cause swollen lymph node near the elbow if not what causes swollen lymph near the elbow , if feels like inflammation right above elbow ?

Elbow lymph node : Usually, an enlarged elbow lymph node is from an infection of the forearm or hand. It can be associated with an illness affecting the entire body. It's best to see a doctor in person to get a specific answer to your concern

Infection below : The enlarged node, if that is what the swelling is, is likely to be due to infection/inflammation below the elbow, i.e. between the hand and elbow. Infection in head would not cause enlarged node near elbow.