Hi, Your bumps behind the neck and ear can be anything from an infection, such as mastoiditis, to an allergic reaction, such as dermatitis. The diagnosis made by your doctors are possible causes of your symptoms. Contact dermatitis and allergic eczema are allergic skin reaction that produces an itchy, red skin rash. The rash may consist of raised, red bumps that ooze, drain, or crust. The allergy can be caused by food, cosmetics (perfumes), metals such as nickel, plants such as to poison ivy. You should know that if you do not avoid the contact with the allergen, the itchy bumps won t disappear, even with different medication. Other potential causes of itchy bumps can be medications, liver disease, kidney disease, insect bites, hives (urticarial), rare forms of skin cancer like mycosis fungoides. Only your doctor can diagnose you properly and prescribe the appropriate treatment. For this reason, my advice is to consult physically your doctor for the right diagnosis and treatment. Hope I have answered your query. Let me know if I can assist you further.