There is a kind of tiny roundworm in some tropical climates that can get into the lymphatic system that causes this.
Also, toxoplasmosis is an illness caused by parasitic protozoa, and also can cause swollen lymph nodes. However, most people don't even get sick with it unless their immune systems were already compromised.
Most parasites, whether mosquitoes of fleas or intestinal worms, will not affect the lymph nodes.
Answers & Comments
Verified answer
There is a kind of tiny roundworm in some tropical climates that can get into the lymphatic system that causes this.
Also, toxoplasmosis is an illness caused by parasitic protozoa, and also can cause swollen lymph nodes. However, most people don't even get sick with it unless their immune systems were already compromised.
Most parasites, whether mosquitoes of fleas or intestinal worms, will not affect the lymph nodes.