we don't know what causes complex cysts in the thyroid gland.
you should get blood anti thyroid antibody testing to see if these levels are high
sometimes your body produces high anti thyroid antibodies which can attack the thyroid gland and cause it to become inflamed.
you should get an ultrasound of that part of the neck. it could be a cyst or a subaceous cyst or an ingrown hair follicle or something else.
let me know if you have other questions.
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