Hello and welcome to HCM In most cases cause is benign and should not worry you. If this I soft and not paiful then this in most cases indicates swollen lymph node, lipoma or atheroma. And ifthis is hard and immobile swelling behind the ear would be a bony swelling, most commonly known as osteoma. These swellings are generally asymptomatic and requires no treatment. However if it increases in size or you develop pain then I would like you to meet a ent doctor for further evaluation and treatment. The other swelling in the neck is likely to be a lymph node and since it has not increased in size for past few years then you have nothing to worry. No treatment is required. Wish you good health. Regards