<s>[INST] I have a knot behind my ear that popped up last night and today I have a knot above my eye and another on my forehead.  I have been having headaches for about a week now. What could this be?  My email is  YYYY@YYYY . Could stress cause this? [/INST] Hello and welcome to ChatDoctorIn most cases 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 Osceola. 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 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 past few years then you have nothing to worry. No treatment is required. Wish you good health. Regards </s>