Swollen lymphnodes behind your ears could be due to chest infection, tonsillitis or pharyngitis,
dandruff, infection of ear or even metastasis from a cancer. 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.