Hello. I Have Recently Had 3 Lymph Nodes Removed To

Hello. I have recently had 3 lymph nodes removed to check for lymphoma. There was no cancer but a silicone granule in one lymph node. 2 weeks after the surgery. I broke out with many of my lymph nodes behind my ear, on my face and neck and under my chin becoming swollen pea size and blistering. Blood tests revealed no infection or virus apparently. Swab test revealed no shingles. Swelling is going away and sores are scabbed. Hoping to explore these episodes more to find out if there may still be a problem. Any test suggestions?