Hi, I have gone through your query and i can understand your concerns. As per your description, your swollen lymph node would be reactive in origin due to inflammation of near by area. You don t need to worry that much because chances for cancer is very unlikely. Post auricular lymph node drains from inner ear,oral cavity and scalp.So we have to examine your oral cavity for dental caries and throat infection and enlarged tonsils. We have to do an ENT examination to rule out infection in your ear.Also check your scalp for dandruff and small boils. As a first line therapy you can take a short course of antibiotics for five to seven days (You can continue your augmentin).If you have pain and discomfort simple analgesics like ibuprofen and paracetamol can be taken. If the nodes persist for long or size is more than one centimeter we would go for a biopsy to rule out other diseases like TB and some forms of lymphoma. I suggest you to consult a general physician and he would guide you accordingly. Hope this information helps. Regards. Dr.Shinas Hussain