Try using a warm compress on the site of the swelling to see if that brings it to a head. Possibly it could be an abcess infection and using a warm damp towel might help it come to a head and drain faster. If there was any increase in the white blood cell count that might point to this being an infection.
You can read about lymphoma here
www.marvistavet.com/html/canine_lymphoma.html
You can read about lumps and bumps here
http://www.peteducation.com/article.cfm?cls=2&cat=1638&articleid=424
Consdier if there is any chance of a bee sting or a spider bite etc too.
Hope this helps you!
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