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You have a very valid query regarding ur partner's health. Lumps on the back of the neck can be from a number of causes the most common among them is infections leading to the swelling of lymph nodes at the posterior triangle of neck. the consisitency and feel of the node can help a physician immensely.
My advise- Get routine investigations of blood done especially the ESR
and PBF. In 9 out of 10 cases, it may be just minor infections. The Amoxycillin
is an antibiotic given to kill such infections. In rare cases; T.B. lymphadenitis
or other rare modiseases may be important. The F.N.A.C is a very useful modality and can eliminate any doubt.