For two years now my one gland on my neck has been swollen & pretty hard. I have a good amount of tiny squish bumps under the skin omy neck. Also I believe you call it a salivary gland, the gland below my chin is hard and swollen. Two years ago I had a bad case of mono, I'm worried something more serious has developed. I'm constantly tired no matter how much sleep I got, it really ruins my day sometimes. Even of it weren't to be lymphoma of some sort what would cause all this?