These 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. Other possibilities are carotid artery aneurysms, abscess, thyroid lumps, lipomas, and cysts.