I am 38 years old and it good health. About 2 weeks ago I noticed a painless lump about the size of a lima bean on the right back side of my neck. At about the same time I also developed a red sore area of skin in between my right ear and my head. The lump got a little bigger about a week ago and now it has shrunk slightly. I was freaked out so I saw my doctor yesterday. He believes it is a swolen lymph node due to the infection on my ear/head. He prescribed antibiotics and a topical steroid solution for the infected red sore area of skin.
He said he was 95% sure is diagnosis is correct. He did mention the word lymphoma though!

Obviously it's the 5% I'm worried about. He told me if the lymph node does not go back to normal within a month to call him and he would send me to a specialist. I have no other symptoms.
My question is...
If I need to see a specialist, what is the
best test. I would like to avoid the run around that many of you have experienced.
Thanks!