Sounds like we got the same issue, never got it as a kid growing up in Florida, I now have two abrasion scars from where it happens. Started on a trip in 2008 to El Salvador, and now a buddy is starting to get it.
Recently the YouTube algorithm pushed this video to me, and I think this is why it started as I aged, kind of the way my rib cage has settled over half a century...I have not done anything he suggests, as I would expect some other problem to arise.
Grab a pack of Moleskin at the pharmacy, I think it may be the answer, it helped last year in El Salvador as well and you're right once it opens up you're fxck'd!