How are you? What other symptoms are present? It is good that you were able to see your doctor and had initial tests done already. The lumps could also be due to a variety of issues such as inflamed lymph nodes brought about by possible infection, lymphoma, and benign cysts. While lymphoma may present with swelling in the neck, underarm, or groin; it may also present with nonspecific symptoms such as fever, chills, unexplained weight loss, night sweats, lethargy, and itching. Additional diagnostic tests such as complete physical exam as well as personal and family medical histories, and imaging techniques such as ct scans, MRI or even lymphangiogram may also be done. Biopsy may also be indicated for definite diagnosis. Do continue the antibiotics as prescribed and discuss the management with your attending physician or surgeon on your follow-up to ease any anxiety. Take care and do keep us posted. Best regards.