Lymphoid hyperplasia is not always a bad thing, especially if it's reactive lymphoid hyperplasia.
I have a distant relative who has this because of HIV. Apparently, it's very common in HIV patients because they are highly prone to infections.
HIV patients have weakened immune systems that cause them to get infections easily. Lymphoid hyperplasia in this case just means that the body is actively fighting bacteria and viruses. The lymph nodes are producing a lot of lymphocytes to fight the infection, so there is a higher chance of overcoming the infection.
My relative was very worried when she heard about lymphoid hyperplasia because she didn't know what it was. But the doctor said that this is a normal, in fact, a positive body reaction in her situation.