lymph node after shot?

[tazmanica]

Hello.My little girl got the mmr vaccine ,the first dose at 4 years old.A week after that i noticed a lump above her collar bone just in front of the acromioclavicular joint.2 days later,one more in the posterior cervical area,and one under her maxillary (she complained about pain in that area for 2 days).I am so very worried bacause of the location of the supraclavicular node(is there a supraclavicular node towards the shoulder?)The node when observed was as large as a pea or maybe a bean..it continued to slightly enlarge over a period of 3 weeks but not getting bigger than a bean.After about a month and a half after the mmr shot the node went down to about a rice-size..it is moveable,but still there after 3 and a half months:(I am so very worried..shoul i get a biopsy?i am fearing lymphoma...but still think that it had to do with the immunization...thank you..