Why is my daughter always sick?

Ever since she was born, i noticed that her right ear was a little different from her left ear. Around Thanksgiving last year, she got really sick. High fever, not eating or wetting her diaper. At, that time, she had those symptoms for about two weeks then got better for a week and then got sick with the same symptoms again. That happened throughout December of last year. Around January, my mom realized a lump above her right ear and thought that was the reason why she kept getting sick. I took her to her in for a health check and told the doctors about it. She said it was probably just a lymph node and will disappear on it's own. Doctor told us to come back in a month for a follow up and when we did, we noticed that it got bigger in size. This time, we saw a different doctor and she said that it was a cyst. Also, ever since Thanksgiving last year, she has constantly been getting sick with a high fever. About every month, she would get a really high fever for about a week. Could it be because of the cyst that she keeps getting these high fever? The cyst doesn't bother her but I am not sure if I should take her to a surgeon to get it removed since she is still really young. But, i know how much a cyst can hurt because I've had one before. Sorry if this may sound confusing.