I had an underlying cancer of some sort that metastasize into my lymph node but was unaware of it?

Hi, I thought I felt a lymph node under my left arm about a month ago – I’ve been checking it routinely and nothing seems to change, as a matter fact I’m not always sure that I even feel it. I’m healthy otherwise, don’t feel pain, no loss of appetite, no weight loss and no fatigue. My concern is that maybe I had an underlying cancer of some sort that metastasize into my lymph node but was in aware of it. I know this is a big jump to conclusions but that’s what I get for reading online. I do have a physical coming up on the 25th but I’m struggling with worry and wanted another opinion. Would I have signs if it were cancer other than little bit of a swollen lip though? I know this can be caused by other things but it’s been a while and again I can barely feel it . Thank you,

Age: 53
Male
Medications: None
No
General Information: I’ve been pretty healthy most of my life, good blood work, etc. At 50 years old I had my first colonoscopy and had two small polyps. One was normal, the other was precancerous. They were very small and removed. Other than that I feel healthy