Top surgery scars, specifically. I found one that's a CW, but not only is it not for sale anywhere in the first place, I doubt I'd be able to afford it if it was because yanno... custom wearables.

Since a lot of the items on the site are named something in-obvious, I figure it wouldn't hurt to check if there are other options available that I just don't have the keywords to find. So, does such an item exist?

In official items, as far as I'm aware there really isn't anything like that. There are some scar items, some more gruesome items (think halloween/horror HAs). Some examples of that kind of thing are: (note, I'm not recommending any of this, just letting you know what's available.)

you should throw this up in the suggestions forum if you haven't already! it would be so, so awesome to see something like this made affordably available for everyone that would like to use it.

This sounds like a nice add! Subeta is so LGTBQ+ friendly I'm actually surprised an item like this does not exist already haha.