Hard lump behind my left ear?

Aug 13 had sore pains in my left mid back side So Aug 17 2012 I had a rash on my left back mid side..Same day went to the e.r. I had the shingles.Doc was a lil shocked sense I'm only 20 but I still had the shingles.He gave me pills to make the virus leave faster & so on.It took about 3-4 weeks for the rash to disappear.(sep 7) (Although I still have the mark till now)Is this lump due to the shingles? Or is it something else?