Should I be concerned ?

I lost count of how long this has been going on for but frequently I get pain in my right armpit. It starts of as a dull ache on and off. The pain appears once a day or sometimes every other day. There have been times where the pain would feel like a sharp stab that would escalate and travel down my arm and sometimes to my right breast. I haven’t noticed any lumps but I seen an enlarged soft tissue around my armpit and breast. It’s hard to explain it isn’t noticeable unless I press on it. Today I used my four fingers to press into my armpit and firmly drag it down to the side of my body. (Sorry if you can’t get the mental image) after I removed my hand I felt pain. I did the same to the other side and I didn’t feel any pain.

Update: went to see a doctor, she examined me and mentioned she couldn’t feel a lump but may organise a scan.