The bump below the ear could be a lymph node which has popped up secondary to the infection in the ear.
It could be an infra-auricular or julodigastric lymphnode. These lymph nodes are noticed when there is an infection in the external ear and the surrounding region. I believe the pimple in the external ear would have got infected because of which this lymph node has popped up.
Most of the time such lymph nodes disappear some time after the infection subsides and are not a cause for concern. However, if the swelling is painful you might need to start on a course of antibiotics after consulting your doctor. In addition you can take an anti-inflammatory medicine such as Tylenol twice daily.
Hope that this information helps and hope that you will get better soon.
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Dr. Naveen Kumar