A pimple grew behind earlobe not ache not itch is how to return a responsibility

You such situation, should be sebaceous cyst, this is a relatively common benign tumor, generally do not need treatment, but the patient had better go to the hospital regularly, in case there are changes in the condition. There may also be lymph node enlargement or lipoma, you can go to the hospital to do B ultrasound, blood routine examination, clear diagnosis.