Swollen Lymph Nodes Under Chin/Jaw Area

Has anyone else ever had their lymph nodes under their chin/jaw area just have swelling come and go for no apparent reason? It always clears in a day or two, and they feel "normal" and ache as expected as far as a swollen one goes. I'm not feeling sick really, though I had a throat itch yesterday that isn't here today. Dentist saw no infection, and tooth X-rays showed nothing. By the time Im at any normal doctor, they're fine. Im just baffled and only getting shrugs from medical professionals it seems like. Maybe I should run to a med express when they're actually swollen? Kinda lost here.