Since started Iodine most of my old injuries from years ago have flared up. knee, back, even a laceration that healed 40 something years ago started pushing out what I think were splinters oozed a little blood then healed over again. Back and knee while initial worse are now feeling better. Can't explain it but have read account of old injuries can flair up then get better which mine did.
Do you have an old injury to your back or is this new?