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Neck lymph nodes can be the result of tonsillitis, pharyngitis (infection of upper throat), infection in mouth, caries in tooth, internal ear infection, outer ear infection, eczema, dermatitis, dandruff, breast cancer, fungal infection, other cancers like lymphoma etc. If you had flu like symptoms initially then it could be due to infectious mononucleosis too. So if streptococcal infection is ruled out then this should be looked into. Another reason for an inflamed throat resulting in swollen lymph nodes is gastric reflux. Raise head end of bed. Take Omeprazole empty stomach in morning and an antacid gel at bedtime. Refrain from smoking, alcohol, fuzzy drinks and spicy food. Get a complete ENT and dental check up before you think of cancer as the cause— less likely as the lymph nodes swell and subside too. It is difficult to comment beyond this at this stage. Do discuss with your doctor. Take care!
I forgot to mention MRI's are not the only way to check for cancer:
Check website it talks about all lab test that can be administered to rule out cancer.
I had a long answer for you but accidentally pushed ignore smh. Basically look at what your eating you may be deficient of iodine. Try rubbing iodine on the area. if it turns from yellow red to you regular skin color quickly then your skin absorbed the iodine and you may need some of that in your body. If not MRI's allows you to see if you have cancerous material growing. If they did find cancer doctors can use radiation to kill the cells either way theres no need to fear since its close to the surface of your skin and easily treatable.