Hello everyone, my child has had swollen lymph nodes at the back of the neck, in the neck, and in th…

Hello everyone, my child has had swollen lymph nodes at the back of the neck, in the neck, and in the groin for about two months or even longer. Two months ago, he had a high fever. Currently, he's teething; he will turn 11 months old on the 17th. We have taken tests — lymphocytes are elevated, as are leukocytes. The doctors said it’s a viral infection. We tested for all viruses, but everything came back negative. We also did a lymphocyte morphology test, which indicated worms. We took a stool sample, and there are no worms, but a hidden bleeding was detected. We’ve seen several doctors and are unsure what to do. One pediatrician suggested it might be oncology. The lymph nodes are movable, and on the neck, they are about 20 cm. Please, if anyone has experienced something similar, what did you do? Thank you for your support.