recurrence worries after mastectomy no recon

I will make another post in the worried about recurrence forum but I know when people feel little lumps or bumps after they've already had breast cancer surgery it can be different if you've had recon vs. flat.

ANYWAY I had DCIS two years ago and am alarmed because after some random electrical/nerve feelings one morning in bed when I turned on my side and looked down I could feel a little pea like bump under my skin that was not there before. It is about 3/4" below my scar line, in between two of my ribs. It does feel quite like what I remember my lump feeling like - my DCIS was originally found that way by a doctor. However, my DCIS was the upper outer quadrant. However it was multi-focal, and the total span was 6cm. They drew this on me once with a pen, which was well above this area.

For those who have had recurrence OR it turned out to be scar tissue/lipoma, what did it feel like? I was initially told that recurrence would appear along the scar line; I thought that meant literally on the scar line. I made a friend feel this and they looked alarmed/they could now understand what I was worried about. They said to them, 3/4" away from the scar line is still along the scar line, not that it matters. I just feel like I was given a lot of nonchalant information like "less than 5 lymph nodes taken the risk is very low just avoid repetitive movements" -- yet I've been jacked up by swelling and have had ribs pushed out of place and nobody who can help me with that.

I was laying on my side in bed making this post and noticed a second visible bump, same (affected side) under the scar. I can imagine that might be scar tissue but I have healed quite well so far. Either way this is quite alarming. Of course I jumped to the most doomed conclusion. I remember how "rock" like and granular scar tissue can feel, this seems different

If it is cancer again, I know they'd try to remove it. If it's that close to the scar would they just cut along my original scar or make a new mark?

I am worried because I've had swollen lymph nodes since my surgery that this would somehow be invasive as well, though I know it is *supposed* to be rare to jump from DCIS to invasive fuck I'm sitting here even worrying about Stage 4 possibility over this. They did a biopsy on one node and put a clip in it, but those samples came back as muscle tissue. A month later I went back in to redo the biopsy, and a second node had swollen, so they biopsied that one instead as it seemed larger, and it was benign. But the node with the clip never got biopsied. Fine Needle Aspirations are hell, and so was waiting 5+ weeks to find out if I had cancer again. Both biopsies were 1.5 hours on a table having a needle push around inside me. I dread it. It has been terrible seeing people reflect on the decade and excited to start a new year where I feel like I am going to die before 40... missing two nodes already impairs my life. I am a low income person who goes to an educational hospital and feel like I am in the hands of incompetent people. I dont' have an oncologist either. They just assumed, DCIS, double mastectomy you're good to go.

If it is not invasive is it just surgery/radiation? I wish I had answers now. I am going to have someone look at it on Friday. I imagine from feeling it they will then tell me to go get an ultrasound, hopefully I can do it that day. This forum can be hard to glean info from by doing a search; that is to say what my odds are seems like a mix of scar tissue scares and recurrences. I hate that this will be a specter in my life forever. The people I know who know I've been through this just think I'm done and fine. They have no idea I can barely carry things in my left arm for fear of lymphedema, and having ribs pushed out of place which is uncomfortable... that I've had to worry about it being back just 10 months after surgery and all the other degradations that come with this. It's alienating and depressing. Would be much easier if I was in my 50s and had peers going through the same thing. But I'm getting off topic now. Happy New Year.