have your medical provider check those "lymph nodes". lymph nodes are always there. they do not come and go but you may only be able to feel them (or see them) when they are enlarged or inflamed. the nodes are there for a reason but it will take a bit of medical investigation to determine the underlying cause or if they are actually lymph nodes (i don't know the location since you didn't share that important bit of information).
can lymph nodes come back? . i have had 2 lymph nodes in 2 years. but this one is more painful while running or walking for a long period of time. what should i do? and ive had it for a week.