<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a small lump upper posterior neck base of skull left side that has been there for 2 days. I have experiencing dizzy spells for 2 weeks. I currently take a low dose of synthroid and cytomel for a lump on my right thyroid. I have also been getting migraine type headache on my right side.  <response>: Hi! This is another fairly common clinical situation in our routine patients and not to worry much regarding this! In fact, considering your medicine history along with thyroid lump, I would like to extend my comments as follows:1. There is 90 possibility that the nodule in the nape of neck is a lymph node recently enlarged in response to some inflammation in the scalp, skin, throat, maxilla, ear etc. or related to medication...!2. Some benign subcutaneous tumor-like condition like neurofibroma lipoma dermatofibroma inclusion cyst comprises 8 possibility3. Some malignancy or borderline tumor pathology have 2 possibility No biopsyradiological study of thyroid lump? It must be there; please share that also!Therefore, you have to see your doctor not because you are worried but to confirm what is it and for some tests like needle biopsy...regards, 