hi. based from your description, it could be a possible cervical lymphadenopathy (inflamed lymph node) probably secondary to a recent upper respiratory tract infection; an inflammation secondary to a muscle strain; a possible lesion of thyroid or salivary gland in origin; other considerations may be fibroma, lipoma or cystic formation. it is best if you consult with a doctor, preferably an ENT or a general surgeon, for physical examination and clinical evaluation. further diagnostic examination such as neck ultrasound, ct-scan or x-ray, thyroid function tests and tissue biopsy will be recommended as needed. malignancy and other tumor types must be ruled-out. subsequent management (medical and/or surgical if indications are found) will be directed accordingly. hope this helps. good day!! ~dr.kaye