hi. it is best if you consult with a doctor, preferably a general surgeon, for medical and physical examination. two things to consider primarily based from your description: 1. a possible cervical lymphadenopathy (inflamed lymph node) probably secondary to a recent upper respiratory tract infection 2. a possible lesion of thyroid or salivary gland in origin. other considerations may be fibroma, lipoma or cyst.. clinical examination from your doctor will be of great help. further diagnostic examination such as neck ultrasound, ct-scan or x-ray and subsequent management (medical and/or surgical if indications are found) will be directed accordingly. hope this helps. good day!! ~dr.kaye