Hello, In most cases, the cause is benign and should not worry you. If this I soft and not painful then this in most cases indicates swollen lymph node, lipoma or atheroma. And if this is hard and immobile swelling behind the ear would be a bony swelling, most commonly known as osteoma. These swellings are generally asymptomatic and require no treatment. However, if it increases in size or you develop pain then I would like you to meet an 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 the past few years then you have nothing to worry. No treatment is required. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Ivan R. Rommstein, General Surgeon