so I've had like scattered painless lymph nodes pop up on my neck, also a itty bitty one behind my ear, heyre quite small i dont notice them unless i touch my neck and I've been to the doctors and they just say it's normal reactive lymph nodes and they're just visible naturally to some people, and I also have some under my jaw which feel bigger and harder, I've been feeling them for like 10 mins now and I notice they fluctuate in size, as in go from bigger to smaller I can feel 2 of them there one smaller and one slightly bigger is this anything to worry about I've heard about the likelihood of things becoming cancerous at early adulthood and I'm nearing that so would it be worth asking for an ultrasound or waste of time and just listen to Dr's. thank u