Lymphoma could present with swelling in any part of body but mostly neck,axilla,abdomen,groin etc. You could also have fever,night sweats and unexplained unintentional weight loss. Usually a biopsy from enlarged lymph node is done for confirmatory diagnosis.Additional tests like CT scan or PETCT may be required. Blood test reports may be normal except decrease in hemoglobin,raised serum LDH..There are no special blood tests to confirm lymphoma