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The lymph nodes usually get enlarged due to infection, inflammation, infiltration. Consider going ahead with your mammogram scan and also consider getting a biopsy done to look that cellular composition of the lymph node swelling. Further treatment measures would be suggested based on examination findings and investigations results to help you control the symptoms. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.